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Solved: 6 Years, 8 Months ago Problem after update to MyBB 1.8.6 (from 1.8.5)
#54
Solved: 6 Years, 8 Months ago
Well, there are also - and + at the beginning of the line except of colors, which symbolise red and green accordingly. Anyways:
db_mysql.php
<?php
/**
 * MyBB 1.8
 * Copyright 2014 MyBB Group, All Rights Reserved
 *
 * Website: http://www.mybb.com
 * License: http://www.mybb.com/about/license
 *
 */

class DB_MySQL implements DB_Base
{
    /**
     * The title of this layer.
     *
     * @var string
     */
    public $title = "MySQL";

    /**
     * The short title of this layer.
     *
     * @var string
     */
    public $short_title = "MySQL";

    /**
     * The type of db software being used.
     *
     * @var string
     */
    public $type;

    /**
     * A count of the number of queries.
     *
     * @var int
     */
    public $query_count = 0;

    /**
     * A list of the performed queries.
     *
     * @var array
     */
    public $querylist = array();

    /**
     * 1 if error reporting enabled, 0 if disabled.
     *
     * @var boolean
     */
    public $error_reporting = 1;

    /**
     * The read database connection resource.
     *
     * @var resource
     */
    public $read_link;

    /**
     * The write database connection resource
     *
     * @var resource
     */
    public $write_link;

    /**
     * Reference to the last database connection resource used.
     *
     * @var resource
     */
    public $current_link;

    /**
     * Explanation of a query.
     *
     * @var string
     */
    public $explain;

    /**
     * The current version of MySQL.
     *
     * @var string
     */
    public $version;

    /**
     * The current table type in use (myisam/innodb)
     *
     * @var string
     */
    public $table_type = "myisam";

    /**
     * The table prefix used for simple select, update, insert and delete queries
     *
     * @var string
     */
    public $table_prefix;

    /**
     * The extension used to run the SQL database
     *
     * @var string
     */
    public $engine = "mysql";

    /**
     * Weather or not this engine can use the search functionality
     *
     * @var boolean
     */
    public $can_search = true;

    /**
     * The database encoding currently in use (if supported)
     *
     * @var string
     */
    public $db_encoding = "utf8";

    /**
     * The time spent performing queries
     *
     * @var float
     */
    public $query_time = 0;

    /**
     * Stores previous run query type: 1 => write; 0 => read
     *
     * @var int
     */

    protected $last_query_type = 0;

    /**
     * Connect to the database server.
     *
     * @param array $config Array of DBMS connection details.
     * @return resource The DB connection resource. Returns false on fail or -1 on a db connect failure.
     */
    function connect($config)
    {
        // Simple connection to one server
        if(array_key_exists('hostname', $config))
        {
            $connections['read'][] = $config;
        }
        // Connecting to more than one server
        else
        {
            // Specified multiple servers, but no specific read/write servers
            if(!array_key_exists('read', $config))
            {
                foreach($config as $key => $settings)
                {
                    if(is_int($key))
                    {
                        $connections['read'][] = $settings;
                    }
                }
            }
            // Specified both read & write servers
            else
            {
                $connections = $config;
            }
        }

        $this->db_encoding = $config['encoding'];

        // Actually connect to the specified servers
        foreach(array('read', 'write') as $type)
        {
            if(!isset($connections[$type]) || !is_array($connections[$type]))
            {
                break;
            }

            if(array_key_exists('hostname', $connections[$type]))
            {
                $details = $connections[$type];
                unset($connections);
                $connections[$type][] = $details;
            }

            // Shuffle the connections
            shuffle($connections[$type]);

            // Loop-de-loop
            foreach($connections[$type] as $single_connection)
            {
                $connect_function = "mysql_connect";
                if(isset($single_connection['pconnect']))
                {
                    $connect_function = "mysql_pconnect";
                }

                $link = "{$type}_link";

                get_execution_time();

                $this->$link = @$connect_function($single_connection['hostname'], $single_connection['username'], $single_connection['password'], 1);

                $time_spent = get_execution_time();
                $this->query_time += $time_spent;

                // Successful connection? break down brother!
                if($this->$link)
                {
                    $this->connections[] = "[".strtoupper($type)."] {$single_connection['username']}@{$single_connection['hostname']} (Connected in ".format_time_duration($time_spent).")";
                    break;
                }
                else
                {
                    $this->connections[] = "<span style=\"color: red\">[FAILED] [".strtoupper($type)."] {$single_connection['username']}@{$single_connection['hostname']}</span>";
                }
            }
        }

        // No write server was specified (simple connection or just multiple servers) - mirror write link
        if(!array_key_exists('write', $connections))
        {
            $this->write_link = &$this->read_link;
        }

        // Have no read connection?
        if(!$this->read_link)
        {
            $this->error("[READ] Unable to connect to MySQL server");
            return false;
        }
        // No write?
        else if(!$this->write_link)
        {
            $this->error("[WRITE] Unable to connect to MySQL server");
            return false;
        }

        // Select databases
        if(!$this->select_db($config['database']))
        {
            return -1;
        }

        $this->current_link = &$this->read_link;
        return $this->read_link;
    }

    /**
     * Selects the database to use.
     *
     * @param string $database The database name.
     * @return boolean True when successfully connected, false if not.
     */
    function select_db($database)
    {
        $this->current_link = &$this->read_link;
        $read_success = @mysql_select_db($database, $this->read_link) or $this->error("[READ] Unable to select database", $this->read_link);
        if($this->write_link)
        {
            $this->current_link = &$this->write_link;
            $write_success = @mysql_select_db($database, $this->write_link) or $this->error("[WRITE] Unable to select database", $this->write_link);
            $success = ($read_success && $write_success ? true : false);
        }
        else
        {
            $success = $read_success;
        }

        if($success && $this->db_encoding)
        {
            // A little magic to support PHP 5.2.0, 5.2.1 and 5.2.2
            if(version_compare(PHP_VERSION, '5.2.3', '>=')) {
                @mysql_set_charset($this->db_encoding, $this->read_link);
            }
            else
            {
                $this->query("SET NAMES '{$this->db_encoding}'");
            }

            if($write_success && count($this->connections) > 1)
            {
                if(version_compare(PHP_VERSION, '5.2.3', '>=')) {
                    @mysql_set_charset($this->db_encoding, $this->write_link);
                }
                else
                {
                    $this->write_query("SET NAMES '{$this->db_encoding}'");
                }
            }
        }
        return $success;
    }

    /**
     * Query the database.
     *
     * @param string $string The query SQL.
     * @param integer $hide_errors 1 if hide errors, 0 if not.
     * @param integer $write_query 1 if executes on master database, 0 if not.
     * @return resource The query data.
     */
    function query($string, $hide_errors=0, $write_query=0)
    {
        global $mybb;

        get_execution_time();

        // Only execute write queries on master database
        if(($write_query || $this->last_query_type) && $this->write_link)
        {
            $this->current_link = &$this->write_link;
            $query = @mysql_query($string, $this->write_link);
        }
        else
        {
            $this->current_link = &$this->read_link;
            $query = @mysql_query($string, $this->read_link);
        }

        if($this->error_number() && !$hide_errors)
        {
             $this->error($string);
             exit;
        }

        if($write_query)
        {
            $this->last_query_type = 1;
        }
        else
        {
            $this->last_query_type = 0;
        }

        $query_time = get_execution_time();
        $this->query_time += $query_time;
        $this->query_count++;

        if($mybb->debug_mode)
        {
            $this->explain_query($string, $query_time);
        }

        return $query;
    }

    /**
     * Execute a write query on the master database
     *
     * @param string $query The query SQL.
     * @param boolean|int $hide_errors 1 if hide errors, 0 if not.
     * @return resource The query data.
     */
    function write_query($query, $hide_errors=0)
    {
        return $this->query($query, $hide_errors, 1);
    }

    /**
     * Explain a query on the database.
     *
     * @param string $string The query SQL.
     * @param string $qtime The time it took to perform the query.
     */
    function explain_query($string, $qtime)
    {
        global $plugins;

        $debug_extra = '';
        if($plugins->current_hook)
        {
            $debug_extra = "<div style=\"float_right\">(Plugin Hook: {$plugins->current_hook})</div>";
        }
        if(preg_match("#^\s*select#i", $string))
        {
            $query = mysql_query("EXPLAIN $string", $this->current_link);
            $this->explain .= "<table style=\"background-color: #666;\" width=\"95%\" cellpadding=\"4\" cellspacing=\"1\" align=\"center\">\n".
                "<tr>\n".
                "<td colspan=\"8\" style=\"background-color: #ccc;\">{$debug_extra}<div><strong>#".$this->query_count." - Select Query</strong></div></td>\n".
                "</tr>\n".
                "<tr>\n".
                "<td colspan=\"8\" style=\"background-color: #fefefe;\"><span style=\"font-family: Courier; font-size: 14px;\">".htmlspecialchars_uni($string)."</span></td>\n".
                "</tr>\n".
                "<tr style=\"background-color: #efefef;\">\n".
                "<td><strong>Table</strong></td>\n".
                "<td><strong>Type</strong></td>\n".
                "<td><strong>Possible Keys</strong></td>\n".
                "<td><strong>Key</strong></td>\n".
                "<td><strong>Key Length</strong></td>\n".
                "<td><strong>Ref</strong></td>\n".
                "<td><strong>Rows</strong></td>\n".
                "<td><strong>Extra</strong></td>\n".
                "</tr>\n";

            while($table = mysql_fetch_array($query))
            {
                $this->explain .=
                    "<tr bgcolor=\"#ffffff\">\n".
                    "<td>".$table['table']."</td>\n".
                    "<td>".$table['type']."</td>\n".
                    "<td>".$table['possible_keys']."</td>\n".
                    "<td>".$table['key']."</td>\n".
                    "<td>".$table['key_len']."</td>\n".
                    "<td>".$table['ref']."</td>\n".
                    "<td>".$table['rows']."</td>\n".
                    "<td>".$table['Extra']."</td>\n".
                    "</tr>\n";
            }
            $this->explain .=
                "<tr>\n".
                "<td colspan=\"8\" style=\"background-color: #fff;\">Query Time: ".format_time_duration($qtime)."</td>\n".
                "</tr>\n".
                "</table>\n".
                "<br />\n";
        }
        else
        {
            $this->explain .= "<table style=\"background-color: #666;\" width=\"95%\" cellpadding=\"4\" cellspacing=\"1\" align=\"center\">\n".
                "<tr>\n".
                "<td style=\"background-color: #ccc;\">{$debug_extra}<div><strong>#".$this->query_count." - Write Query</strong></div></td>\n".
                "</tr>\n".
                "<tr style=\"background-color: #fefefe;\">\n".
                "<td><span style=\"font-family: Courier; font-size: 14px;\">".htmlspecialchars_uni($string)."</span></td>\n".
                "</tr>\n".
                "<tr>\n".
                "<td bgcolor=\"#ffffff\">Query Time: ".format_time_duration($qtime)."</td>\n".
                "</tr>\n".
                "</table>\n".
                "<br />\n";
        }

        $this->querylist[$this->query_count]['query'] = $string;
        $this->querylist[$this->query_count]['time'] = $qtime;
    }

    /**
     * Return a result array for a query.
     *
     * @param resource $query The query ID.
     * @param int $resulttype The type of array to return. Either MYSQL_NUM, MYSQL_BOTH or MYSQL_ASSOC
     * @return array The array of results.
     */
    function fetch_array($query, $resulttype=MYSQL_ASSOC)
    {
        switch($resulttype)
        {
            case MYSQL_NUM:
            case MYSQL_BOTH:
                break;
            default:
                $resulttype = MYSQL_ASSOC;
                break;
        }

        $array = mysql_fetch_array($query, $resulttype);

        return $array;
    }

    /**
     * Return a specific field from a query.
     *
     * @param resource $query The query ID.
     * @param string $field The name of the field to return.
     * @param int|bool $row The number of the row to fetch it from.
     * @return mixed
     */
    function fetch_field($query, $field, $row=false)
    {
        if($row === false)
        {
            $array = $this->fetch_array($query);
            return $array[$field];
        }
        else
        {
            return mysql_result($query, $row, $field);
        }
    }

    /**
     * Moves internal row pointer to the next row
     *
     * @param resource $query The query ID.
     * @param int $row The pointer to move the row to.
     * @return bool
     */
    function data_seek($query, $row)
    {
        return mysql_data_seek($query, $row);
    }

    /**
     * Return the number of rows resulting from a query.
     *
     * @param resource $query The query ID.
     * @return int The number of rows in the result.
     */
    function num_rows($query)
    {
        return mysql_num_rows($query);
    }

    /**
     * Return the last id number of inserted data.
     *
     * @return int The id number.
     */
    function insert_id()
    {
        return mysql_insert_id($this->current_link);
    }

    /**
     * Close the connection with the DBMS.
     *
     */
    function close()
    {
        @mysql_close($this->read_link);
        if($this->write_link)
        {
            @mysql_close($this->write_link);
        }
    }

    /**
     * Return an error number.
     *
     * @return int The error number of the current error.
     */
    function error_number()
    {
        if($this->current_link)
        {
            return @mysql_errno($this->current_link);
        }
        else
        {
            return @mysql_errno();
        }
    }

    /**
     * Return an error string.
     *
     * @return string The explanation for the current error.
     */
    function error_string()
    {
        if($this->current_link)
        {
            return @mysql_error($this->current_link);
        }
        else
        {
            return @mysql_error();
        }
    }

    /**
     * Output a database error.
     *
     * @param string $string The string to present as an error.
     * @return bool Returns false if error reporting is disabled, otherwise true
     */
    function error($string="")
    {
        if($this->error_reporting)
        {
            if(class_exists("errorHandler"))
            {
                global $error_handler;

                if(!is_object($error_handler))
                {
                    require_once MYBB_ROOT."inc/class_error.php";
                    $error_handler = new errorHandler();
                }

                $error = array(
                    "error_no" => $this->error_number(),
                    "error" => $this->error_string(),
                    "query" => $string
                );
                $error_handler->error(MYBB_SQL, $error);
            }
            else
            {
                trigger_error("<strong>[SQL] [".$this->error_number()."] ".$this->error_string()."</strong><br />{$string}", E_USER_ERROR);
            }

            return true;
        }
        else
        {
            return false;
        }
    }

    /**
     * Returns the number of affected rows in a query.
     *
     * @return int The number of affected rows.
     */
    function affected_rows()
    {
        return mysql_affected_rows($this->current_link);
    }

    /**
     * Return the number of fields.
     *
     * @param resource $query The query ID.
     * @return int The number of fields.
     */
    function num_fields($query)
    {
        return mysql_num_fields($query);
    }

    /**
     * Lists all tables in the database.
     *
     * @param string $database The database name.
     * @param string $prefix Prefix of the table (optional)
     * @return array The table list.
     */
    function list_tables($database, $prefix='')
    {
        if($prefix)
        {
            $query = $this->query("SHOW TABLES FROM `$database` LIKE '".$this->escape_string($prefix)."%'");
        }
        else
        {
            $query = $this->query("SHOW TABLES FROM `$database`");
        }

        $tables = array();
        while(list($table) = mysql_fetch_array($query))
        {
            $tables[] = $table;
        }

        return $tables;
    }

    /**
     * Check if a table exists in a database.
     *
     * @param string $table The table name.
     * @return boolean True when exists, false if not.
     */
    function table_exists($table)
    {
        // Execute on master server to ensure if we've just created a table that we get the correct result
        $query = $this->write_query("
			SHOW TABLES
			LIKE '{$this->table_prefix}$table'
        ");
        $exists = $this->num_rows($query);
        if($exists > 0)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    /**
     * Check if a field exists in a database.
     *
     * @param string $field The field name.
     * @param string $table The table name.
     * @return boolean True when exists, false if not.
     */
    function field_exists($field, $table)
    {
        $query = $this->write_query("
            SHOW COLUMNS
            FROM {$this->table_prefix}$table
            LIKE '$field'
        ");
        $exists = $this->num_rows($query);
        if($exists > 0)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    /**
     * Add a shutdown query.
     *
     * @param resource $query The query data.
     * @param string $name An optional name for the query.
     */
    function shutdown_query($query, $name="")
    {
        global $shutdown_queries;
        if($name)
        {
            $shutdown_queries[$name] = $query;
        }
        else
        {
            $shutdown_queries[] = $query;
        }
    }
    /**
     * Performs a simple select query.
     *
     * @param string $table The table name to be queried.
     * @param string $fields Comma delimetered list of fields to be selected.
     * @param string $conditions SQL formatted list of conditions to be matched.
     * @param array $options List of options: group by, order by, order direction, limit, limit start.
     * @return resource The query data.
     */
    function simple_select($table, $fields="*", $conditions="", $options=array())
    {
        $query = "SELECT ".$fields." FROM {$this->table_prefix}{$table}";
        if($conditions != "")
        {
            $query .= " WHERE ".$conditions;
        }

        if(isset($options['group_by']))
        {
            $query .= " GROUP BY ".$options['group_by'];
        }

        if(isset($options['order_by']))
        {
            $query .= " ORDER BY ".$options['order_by'];
            if(isset($options['order_dir']))
            {
                $query .= " ".my_strtoupper($options['order_dir']);
            }
        }

        if(isset($options['limit_start']) && isset($options['limit']))
        {
            $query .= " LIMIT ".$options['limit_start'].", ".$options['limit'];
        }
        elseif(isset($options['limit']))
        {
            $query .= " LIMIT ".$options['limit'];
        }

        return $this->query($query);
    }

    /**
     * Build an insert query from an array.
     *
     * @param string $table The table name to perform the query on.
     * @param array $array An array of fields and their values.
     * @return int The insert ID if available
     */
    function insert_query($table, $array)
    {
        global $mybb;

        if(!is_array($array))
        {
            return false;
        }

        foreach($array as $field => $value)
        {
            if(isset($mybb->binary_fields[$table][$field]) && $mybb->binary_fields[$table][$field])
            {
                if($value[0] != 'X') // Not escaped?
                {
                    $value = $this->escape_binary($value);
                }
                
                $array[$field] = $value;
            }
            else
            {
                $array[$field] = $this->quote_val($value);
            }
        }

        $fields = "`".implode("`,`", array_keys($array))."`";
        $values = implode(",", $array);
        $this->write_query("
            INSERT
            INTO {$this->table_prefix}{$table} (".$fields.")
            VALUES (".$values.")
        ");
        return $this->insert_id();
    }

    /**
     * Build one query for multiple inserts from a multidimensional array.
     *
     * @param string $table The table name to perform the query on.
     * @param array $array An array of inserts.
     * @return void
     */
    function insert_query_multiple($table, $array)
    {
        global $mybb;

        if(!is_array($array))
        {
            return;
        }

        // Field names
        $fields = array_keys($array[0]);
        $fields = "`".implode("`,`", $fields)."`";

        $insert_rows = array();
        foreach($array as $values)
        {
            foreach($values as $field => $value)
            {
                if(isset($mybb->binary_fields[$table][$field]) && $mybb->binary_fields[$table][$field])
                {
                    if($value[0] != 'X') // Not escaped?
                    {
                        $value = $this->escape_binary($value);
                    }
                
                    $values[$field] = $value;
                }
                else
                {
                    $values[$field] = $this->quote_val($value);
                }
            }
            $insert_rows[] = "(".implode(",", $values).")";
        }
        $insert_rows = implode(", ", $insert_rows);

        $this->write_query("
            INSERT
            INTO {$this->table_prefix}{$table} ({$fields})
            VALUES {$insert_rows}
        ");
    }

    /**
     * Build an update query from an array.
     *
     * @param string $table The table name to perform the query on.
     * @param array $array An array of fields and their values.
     * @param string $where An optional where clause for the query.
     * @param string $limit An optional limit clause for the query.
     * @param boolean $no_quote An option to quote incoming values of the array.
     * @return resource The query data.
     */
    function update_query($table, $array, $where="", $limit="", $no_quote=false)
    {
        global $mybb;

        if(!is_array($array))
        {
            return false;
        }

        $comma = "";
        $query = "";
        $quote = "'";

        if($no_quote == true)
        {
            $quote = "";
        }

        foreach($array as $field => $value)
        {
            if(isset($mybb->binary_fields[$table][$field]) && $mybb->binary_fields[$table][$field])
            {
                if($value[0] != 'X') // Not escaped?
                {
                    $value = $this->escape_binary($value);
                }
                
                $query .= $comma."`".$field."`={$value}";
            }
            else
            {
                $quoted_val = $this->quote_val($value, $quote);

                $query .= $comma."`".$field."`={$quoted_val}";
            }
            $comma = ', ';
        }

        if(!empty($where))
        {
            $query .= " WHERE $where";
        }

        if(!empty($limit))
        {
            $query .= " LIMIT $limit";
        }

        return $this->write_query("
            UPDATE {$this->table_prefix}$table
            SET $query
        ");
    }

    /**
     * @param int|string $value
     * @param string $quote
     *
     * @return int|string
     */
    private function quote_val($value, $quote="'")
    {
        if(is_int($value))
        {
            $quoted = $value;
        }
        else
        {
            $quoted = $quote . $value . $quote;
        }

        return $quoted;
    }

    /**
     * Build a delete query.
     *
     * @param string $table The table name to perform the query on.
     * @param string $where An optional where clause for the query.
     * @param string $limit An optional limit clause for the query.
     * @return resource The query data.
     */
    function delete_query($table, $where="", $limit="")
    {
        $query = "";
        if(!empty($where))
        {
            $query .= " WHERE $where";
        }

        if(!empty($limit))
        {
            $query .= " LIMIT $limit";
        }

        return $this->write_query("
            DELETE
            FROM {$this->table_prefix}$table
            $query
        ");
    }

    /**
     * Escape a string according to the MySQL escape format.
     *
     * @param string $string The string to be escaped.
     * @return string The escaped string.
     */
    function escape_string($string)
    {
        if($this->db_encoding == 'utf8')
        {
            $string = validate_utf8_string($string, false);
        }
        elseif($this->db_encoding == 'utf8mb4')
        {
            $string = validate_utf8_string($string);
        }

        if(function_exists("mysql_real_escape_string") && $this->read_link)
        {
            $string = mysql_real_escape_string($string, $this->read_link);
        }
        else
        {
            $string = addslashes($string);
        }
        return $string;
    }

    /**
     * Frees the resources of a MySQLi query.
     *
     * @param resource $query The query to destroy.
     * @return boolean Returns true on success, false on faliure
     */
    function free_result($query)
    {
        return mysql_free_result($query);
    }

    /**
     * Escape a string used within a like command.
     *
     * @param string $string The string to be escaped.
     * @return string The escaped string.
     */
    function escape_string_like($string)
    {
        return $this->escape_string(str_replace(array('%', '_') , array('\\%' , '\\_') , $string));
    }

    /**
     * Gets the current version of MySQL.
     *
     * @return string Version of MySQL.
     */
    function get_version()
    {
        if($this->version)
        {
            return $this->version;
        }

        $version = @mysql_get_server_info();
        if(!$version)
        {
            $query = $this->query("SELECT VERSION() as version");
            $ver = $this->fetch_array($query);
            $version = $ver['version'];
        }

        if($version)
        {
            $version = explode(".", $version, 3);
            $this->version = (int)$version[0].".".(int)$version[1].".".(int)$version[2];
        }
        return $this->version;
    }

    /**
     * Optimizes a specific table.
     *
     * @param string $table The name of the table to be optimized.
     */
    function optimize_table($table)
    {
        $this->write_query("OPTIMIZE TABLE {$this->table_prefix}{$table}");
    }

    /**
     * Analyzes a specific table.
     *
     * @param string $table The name of the table to be analyzed.
     */
    function analyze_table($table)
    {
        $this->write_query("ANALYZE TABLE {$this->table_prefix}{$table}");
    }

    /**
     * Show the "create table" command for a specific table.
     *
     * @param string $table The name of the table.
     * @return string The MySQL command to create the specified table.
     */
    function show_create_table($table)
    {
        $query = $this->write_query("SHOW CREATE TABLE {$this->table_prefix}{$table}");
        $structure = $this->fetch_array($query);
        return $structure['Create Table'];
    }

    /**
     * Show the "show fields from" command for a specific table.
     *
     * @param string $table The name of the table.
     * @return array Field info for that table
     */
    function show_fields_from($table)
    {
        $query = $this->write_query("SHOW FIELDS FROM {$this->table_prefix}{$table}");
        $field_info = array();
        while($field = $this->fetch_array($query))
        {
            $field_info[] = $field;
        }
        return $field_info;
    }

    /**
     * Returns whether or not the table contains a fulltext index.
     *
     * @param string $table The name of the table.
     * @param string $index Optionally specify the name of the index.
     * @return boolean True or false if the table has a fulltext index or not.
     */
    function is_fulltext($table, $index="")
    {
        $structure = $this->show_create_table($table);
        if($index != "")
        {
            if(preg_match("#FULLTEXT KEY (`?)$index(`?)#i", $structure))
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        if(preg_match('#FULLTEXT KEY#i', $structure))
        {
            return true;
        }
        return false;
    }

    /**
     * Returns whether or not this database engine supports fulltext indexing.
     *
     * @param string $table The table to be checked.
     * @return boolean True or false if supported or not.
     */

    function supports_fulltext($table)
    {
        $version = $this->get_version();
        $query = $this->write_query("SHOW TABLE STATUS LIKE '{$this->table_prefix}$table'");
        $status = $this->fetch_array($query);
        if($status['Engine'])
        {
            $table_type = my_strtoupper($status['Engine']);
        }
        else
        {
            $table_type = my_strtoupper($status['Type']);
        }
        if(version_compare($version, '3.23.23', '>=') && ($table_type == 'MYISAM' || $table_type == 'ARIA'))
        {
            return true;
        }
        elseif(version_compare($version, '5.6', '>=') && $table_type == 'INNODB')
        {
            return true;
        }
        return false;
    }

    /**
     * Checks to see if an index exists on a specified table
     *
     * @param string $table The name of the table.
     * @param string $index The name of the index.
     * @return bool Whether or not the index exists in that table
     */
    function index_exists($table, $index)
    {
        $index_exists = false;
        $query = $this->write_query("SHOW INDEX FROM {$this->table_prefix}{$table}");
        while($ukey = $this->fetch_array($query))
        {
            if($ukey['Key_name'] == $index)
            {
                $index_exists = true;
                break;
            }
        }

        if($index_exists)
        {
            return true;
        }

        return false;
    }

    /**
     * Returns whether or not this database engine supports boolean fulltext matching.
     *
     * @param string $table The table to be checked.
     * @return boolean True or false if supported or not.
     */
    function supports_fulltext_boolean($table)
    {
        $version = $this->get_version();
        $supports_fulltext = $this->supports_fulltext($table);
        if(version_compare($version, '4.0.1', '>=') && $supports_fulltext == true)
        {
            return true;
        }
        return false;
    }

    /**
     * Creates a fulltext index on the specified column in the specified table with optional index name.
     *
     * @param string $table The name of the table.
     * @param string $column Name of the column to be indexed.
     * @param string $name The index name, optional.
     */
    function create_fulltext_index($table, $column, $name="")
    {
        $this->write_query("
            ALTER TABLE {$this->table_prefix}$table
            ADD FULLTEXT $name ($column)
        ");
    }

    /**
     * Drop an index with the specified name from the specified table
     *
     * @param string $table The name of the table.
     * @param string $name The name of the index.
     */
    function drop_index($table, $name)
    {
        $this->write_query("
            ALTER TABLE {$this->table_prefix}$table
            DROP INDEX $name
        ");
    }

    /**
     * Drop an table with the specified table
     *
     * @param string $table The table to drop
     * @param boolean $hard hard drop - no checking
     * @param boolean $table_prefix use table prefix
     */
    function drop_table($table, $hard=false, $table_prefix=true)
    {
        if($table_prefix == false)
        {
            $table_prefix = "";
        }
        else
        {
            $table_prefix = $this->table_prefix;
        }

        if($hard == false)
        {
            $this->write_query('DROP TABLE IF EXISTS '.$table_prefix.$table);
        }
        else
        {
            $this->write_query('DROP TABLE '.$table_prefix.$table);
        }
    }

    /**
     * Renames a table
     *
     * @param string $old_table The old table name
     * @param string $new_table the new table name
     * @param boolean $table_prefix use table prefix
     * @return resource
     */
    function rename_table($old_table, $new_table, $table_prefix=true)
    {
        if($table_prefix == false)
        {
            $table_prefix = "";
        }
        else
        {
            $table_prefix = $this->table_prefix;
        }

        return $this->write_query("RENAME TABLE {$table_prefix}{$old_table} TO {$table_prefix}{$new_table}");
    }

    /**
     * Replace contents of table with values
     *
     * @param string $table The table
     * @param array $replacements The replacements
     * @return resource|bool
     */
    function replace_query($table, $replacements=array())
    {
        global $mybb;

        $values = '';
        $comma = '';
        foreach($replacements as $column => $value)
        {
            if(isset($mybb->binary_fields[$table][$column]) && $mybb->binary_fields[$table][$column])
            {
                if($value[0] != 'X') // Not escaped?
                {
                    $value = $this->escape_binary($value);
                }
                
                $values .= $comma."`".$column."`=".$value;
            }
            else
            {
                $values .= $comma."`".$column."`=".$this->quote_val($value);
            }

            $comma = ',';
        }

        if(empty($replacements))
        {
             return false;
        }

        return $this->write_query("REPLACE INTO {$this->table_prefix}{$table} SET {$values}");
    }

    /**
     * Drops a column
     *
     * @param string $table The table
     * @param string $column The column name
     * @return resource
     */
    function drop_column($table, $column)
    {
        return $this->write_query("ALTER TABLE {$this->table_prefix}{$table} DROP {$column}");
    }

    /**
     * Adds a column
     *
     * @param string $table The table
     * @param string $column The column name
     * @param string $definition the new column definition
     * @return resource
     */
    function add_column($table, $column, $definition)
    {
        return $this->write_query("ALTER TABLE {$this->table_prefix}{$table} ADD {$column} {$definition}");
    }

    /**
     * Modifies a column
     *
     * @param string $table The table
     * @param string $column The column name
     * @param string $new_definition the new column definition
     * @return resource
     */
    function modify_column($table, $column, $new_definition)
    {
        return $this->write_query("ALTER TABLE {$this->table_prefix}{$table} MODIFY {$column} {$new_definition}");
    }

    /**
     * Renames a column
     *
     * @param string $table The table
     * @param string $old_column The old column name
     * @param string $new_column the new column name
     * @param string $new_definition the new column definition
     * @return resource
     */
    function rename_column($table, $old_column, $new_column, $new_definition)
    {
        return $this->write_query("ALTER TABLE {$this->table_prefix}{$table} CHANGE {$old_column} {$new_column} {$new_definition}");
    }

    /**
     * Sets the table prefix used by the simple select, insert, update and delete functions
     *
     * @param string $prefix The new table prefix
     */
    function set_table_prefix($prefix)
    {
        $this->table_prefix = $prefix;
    }

    /**
     * Fetched the total size of all mysql tables or a specific table
     *
     * @param string $table The table (optional)
     * @return integer the total size of all mysql tables or a specific table
     */
    function fetch_size($table='')
    {
        if($table != '')
        {
            $query = $this->query("SHOW TABLE STATUS LIKE '".$this->table_prefix.$table."'");
        }
        else
        {
            $query = $this->query("SHOW TABLE STATUS");
        }
        $total = 0;
        while($table = $this->fetch_array($query))
        {
            $total += $table['Data_length']+$table['Index_length'];
        }
        return $total;
    }

    /**
     * Fetch a list of database character sets this DBMS supports
     *
     * @return array|bool Array of supported character sets with array key being the name, array value being display name. False if unsupported
     */
    function fetch_db_charsets()
    {
        if($this->write_link && version_compare($this->get_version(), "4.1", "<"))
        {
            return false;
        }
        return array(
            'big5' => 'Big5 Traditional Chinese',
            'dec8' => 'DEC West European',
            'cp850' => 'DOS West European',
            'hp8' => 'HP West European',
            'koi8r' => 'KOI8-R Relcom Russian',
            'latin1' => 'ISO 8859-1 Latin 1',
            'latin2' => 'ISO 8859-2 Central European',
            'swe7' => '7bit Swedish',
            'ascii' => 'US ASCII',
            'ujis' => 'EUC-JP Japanese',
            'sjis' => 'Shift-JIS Japanese',
            'hebrew' => 'ISO 8859-8 Hebrew',
            'tis620' => 'TIS620 Thai',
            'euckr' => 'EUC-KR Korean',
            'koi8u' => 'KOI8-U Ukrainian',
            'gb2312' => 'GB2312 Simplified Chinese',
            'greek' => 'ISO 8859-7 Greek',
            'cp1250' => 'Windows Central European',
            'gbk' => 'GBK Simplified Chinese',
            'latin5' => 'ISO 8859-9 Turkish',
            'armscii8' => 'ARMSCII-8 Armenian',
            'utf8' => 'UTF-8 Unicode',
            'utf8mb4' => '4-Byte UTF-8 Unicode (requires MySQL 5.5.3 or above)',
            'ucs2' => 'UCS-2 Unicode',
            'cp866' => 'DOS Russian',
            'keybcs2' => 'DOS Kamenicky Czech-Slovak',
            'macce' => 'Mac Central European',
            'macroman' => 'Mac West European',
            'cp852' => 'DOS Central European',
            'latin7' => 'ISO 8859-13 Baltic',
            'cp1251' => 'Windows Cyrillic',
            'cp1256' => 'Windows Arabic',
            'cp1257' => 'Windows Baltic',
            'binary' => 'Binary pseudo charset',
            'geostd8' => 'GEOSTD8 Georgian',
            'cp932' => 'SJIS for Windows Japanese',
            'eucjpms' => 'UJIS for Windows Japanese',
        );
    }

    /**
     * Fetch a database collation for a particular database character set
     *
     * @param string  $charset The database character set
     * @return string|bool The matching database collation, false if unsupported
     */
    function fetch_charset_collation($charset)
    {
        $collations = array(
            'big5' => 'big5_chinese_ci',
            'dec8' => 'dec8_swedish_ci',
            'cp850' => 'cp850_general_ci',
            'hp8' => 'hp8_english_ci',
            'koi8r' => 'koi8r_general_ci',
            'latin1' => 'latin1_swedish_ci',
            'latin2' => 'latin2_general_ci',
            'swe7' => 'swe7_swedish_ci',
            'ascii' => 'ascii_general_ci',
            'ujis' => 'ujis_japanese_ci',
            'sjis' => 'sjis_japanese_ci',
            'hebrew' => 'hebrew_general_ci',
            'tis620' => 'tis620_thai_ci',
            'euckr' => 'euckr_korean_ci',
            'koi8u' => 'koi8u_general_ci',
            'gb2312' => 'gb2312_chinese_ci',
            'greek' => 'greek_general_ci',
            'cp1250' => 'cp1250_general_ci',
            'gbk' => 'gbk_chinese_ci',
            'latin5' => 'latin5_turkish_ci',
            'armscii8' => 'armscii8_general_ci',
            'utf8' => 'utf8_general_ci',
            'utf8mb4' => 'utf8mb4_general_ci',
            'ucs2' => 'ucs2_general_ci',
            'cp866' => 'cp866_general_ci',
            'keybcs2' => 'keybcs2_general_ci',
            'macce' => 'macce_general_ci',
            'macroman' => 'macroman_general_ci',
            'cp852' => 'cp852_general_ci',
            'latin7' => 'latin7_general_ci',
            'cp1251' => 'cp1251_general_ci',
            'cp1256' => 'cp1256_general_ci',
            'cp1257' => 'cp1257_general_ci',
            'binary' => 'binary',
            'geostd8' => 'geostd8_general_ci',
            'cp932' => 'cp932_japanese_ci',
            'eucjpms' => 'eucjpms_japanese_ci',
        );
        if($collations[$charset])
        {
            return $collations[$charset];
        }
        return false;
    }

    /**
     * Fetch a character set/collation string for use with CREATE TABLE statements. Uses current DB encoding
     *
     * @return string The built string, empty if unsupported
     */
    function build_create_table_collation()
    {
        if(!$this->db_encoding)
        {
            return '';
        }

        $collation = $this->fetch_charset_collation($this->db_encoding);
        if(!$collation)
        {
            return '';
        }
        return " CHARACTER SET {$this->db_encoding} COLLATE {$collation}";
    }

    /**
     * Time how long it takes for a particular piece of code to run. Place calls above & below the block of code.
     *
     * @deprecated
     */
    function get_execution_time()
    {
        return get_execution_time();
    }

    /**
     * Binary database fields require special attention.
     *
     * @param string $string Binary value
     * @return string Encoded binary value
     */
    function escape_binary($string)
    {
        return "X'".$this->escape_string(bin2hex($string))."'";
    }

    /**
     * Unescape binary data.
     *
     * @param string $string Binary value
     * @return string Encoded binary value
     */
    function unescape_binary($string)
    {
        // Nothing to do
        return $string;
    }
}

db._mysqli.php
<?php
/**
 * MyBB 1.8
 * Copyright 2014 MyBB Group, All Rights Reserved
 *
 * Website: http://www.mybb.com
 * License: http://www.mybb.com/about/license
 *
 */

class DB_MySQLi implements DB_Base
{
    /**
     * The title of this layer.
     *
     * @var string
     */
    public $title = "MySQLi";

    /**
     * The short title of this layer.
     *
     * @var string
     */
    public $short_title = "MySQLi";

    /**
     * The type of db software being used.
     *
     * @var string
     */
    public $type;

    /**
     * A count of the number of queries.
     *
     * @var int
     */
    public $query_count = 0;

    /**
     * A list of the performed queries.
     *
     * @var array
     */
    public $querylist = array();

    /**
     * 1 if error reporting enabled, 0 if disabled.
     *
     * @var boolean
     */
    public $error_reporting = 1;

    /**
     * The read database connection resource.
     *
     * @var mysqli
     */
    public $read_link;

    /**
     * The write database connection resource
     *
     * @var mysqli
     */
    public $write_link;

    /**
     * Reference to the last database connection resource used.
     *
     * @var mysqli
     */
    public $current_link;

    /**
     * Explanation of a query.
     *
     * @var string
     */
    public $explain;

    /**
     * The current version of MySQL.
     *
     * @var string
     */
    public $version;

    /**
     * The current table type in use (myisam/innodb)
     *
     * @var string
     */
    public $table_type = "myisam";

    /**
     * The table prefix used for simple select, update, insert and delete queries
     *
     * @var string
     */
    public $table_prefix;

    /**
     * The extension used to run the SQL database
     *
     * @var string
     */
    public $engine = "mysqli";

    /**
     * Weather or not this engine can use the search functionality
     *
     * @var boolean
     */
    public $can_search = true;

    /**
     * The database encoding currently in use (if supported)
     *
     * @var string
     */
    public $db_encoding = "utf8";

    /**
     * The time spent performing queries
     *
     * @var float
     */
    public $query_time = 0;

    /**
     * Stores previous run query type: 1 => write; 0 => read
     *
     * @var int
     */
    protected $last_query_type = 0;

    /**
     * Connect to the database server.
     *
     * @param array $config Array of DBMS connection details.
     * @return mysqli The DB connection resource. Returns false on fail or -1 on a db connect failure.
     */
    function connect($config)
    {
        // Simple connection to one server
        if(array_key_exists('hostname', $config))
        {
            $connections['read'][] = $config;
        }
        else
        // Connecting to more than one server
        {
            // Specified multiple servers, but no specific read/write servers
            if(!array_key_exists('read', $config))
            {
                foreach($config as $key => $settings)
                {
                    if(is_int($key))
                    {
                        $connections['read'][] = $settings;
                    }
                }
            }
            // Specified both read & write servers
            else
            {
                $connections = $config;
            }
        }

        $this->db_encoding = $config['encoding'];

        // Actually connect to the specified servers
        foreach(array('read', 'write') as $type)
        {
            if(!isset($connections[$type]) || !is_array($connections[$type]))
            {
                break;
            }

            if(array_key_exists('hostname', $connections[$type]))
            {
                $details = $connections[$type];
                unset($connections);
                $connections[$type][] = $details;
            }

            // Shuffle the connections
            shuffle($connections[$type]);

            // Loop-de-loop
            foreach($connections[$type] as $single_connection)
            {
                $connect_function = "mysqli_connect";
                $persist = "";
                if(!empty($single_connection['pconnect']) && version_compare(PHP_VERSION, '5.3.0', '>='))
                {
                    $persist = 'p:';
                }

                $link = "{$type}_link";

                get_execution_time();

                // Specified a custom port for this connection?
                $port = 0;
                if(strstr($single_connection['hostname'],':'))
                {
                    list($hostname, $port) = explode(":", $single_connection['hostname'], 2);
                }

                if($port)
                {
                    $this->$link = @$connect_function($persist.$hostname, $single_connection['username'], $single_connection['password'], "", $port);
                }
                else
                {
                    $this->$link = @$connect_function($persist.$single_connection['hostname'], $single_connection['username'], $single_connection['password']);
                }

                $time_spent = get_execution_time();
                $this->query_time += $time_spent;

                // Successful connection? break down brother!
                if($this->$link)
                {
                    $this->connections[] = "[".strtoupper($type)."] {$single_connection['username']}@{$single_connection['hostname']} (Connected in ".format_time_duration($time_spent).")";
                    break;
                }
                else
                {
                    $this->connections[] = "<span style=\"color: red\">[FAILED] [".strtoupper($type)."] {$single_connection['username']}@{$single_connection['hostname']}</span>";
                }
            }
        }

        // No write server was specified (simple connection or just multiple servers) - mirror write link
        if(!array_key_exists('write', $connections))
        {
            $this->write_link = &$this->read_link;
        }

        // Have no read connection?
        if(!$this->read_link)
        {
            $this->error("[READ] Unable to connect to MySQL server");
            return false;
        }
        // No write?
        else if(!$this->write_link)
        {
            $this->error("[WRITE] Unable to connect to MySQL server");
            return false;
        }

        // Select databases
        if(!$this->select_db($config['database']))
        {
            return -1;
        }

        $this->current_link = &$this->read_link;
        return $this->read_link;
    }

    /**
     * Selects the database to use.
     *
     * @param string $database The database name.
     * @return boolean True when successfully connected, false if not.
     */
    function select_db($database)
    {
        $master_success = @mysqli_select_db($this->read_link, $database) or $this->error("[READ] Unable to select database", $this->read_link);
        if($this->write_link)
        {
            $slave_success = @mysqli_select_db($this->write_link, $database) or $this->error("[WRITE] Unable to select slave database", $this->write_link);

            $success = ($master_success && $slave_success ? true : false);
        }
        else
        {
            $success = $master_success;
        }

        if($success && $this->db_encoding)
        {
            @mysqli_set_charset($this->read_link, $this->db_encoding);

            if($slave_success && count($this->connections) > 1)
            {
                @mysqli_set_charset($this->write_link, $this->db_encoding);
            }
        }
        return $success;
    }

    /**
     * Query the database.
     *
     * @param string $string The query SQL.
     * @param boolean|int $hide_errors 1 if hide errors, 0 if not.
     * @param integer $write_query 1 if executes on master database, 0 if not.
     * @return mysqli_result The query data.
     */
    function query($string, $hide_errors=0, $write_query=0)
    {
        global $mybb;

        get_execution_time();

        // Only execute write queries on master server
        if(($write_query || $this->last_query_type) && $this->write_link)
        {
            $this->current_link = &$this->write_link;
            $query = @mysqli_query($this->write_link, $string);
        }
        else
        {
            $this->current_link = &$this->read_link;
            $query = @mysqli_query($this->read_link, $string);
        }

        if($this->error_number() && !$hide_errors)
        {
            $this->error($string);
            exit;
        }

        if($write_query)
        {
            $this->last_query_type = 1;
        }
        else
        {
            $this->last_query_type = 0;
        }

        $query_time = get_execution_time();
        $this->query_time += $query_time;
        $this->query_count++;

        if($mybb->debug_mode)
        {
            $this->explain_query($string, $query_time);
        }
        return $query;
    }

    /**
     * Execute a write query on the master database
     *
     * @param string $query The query SQL.
     * @param boolean|int $hide_errors 1 if hide errors, 0 if not.
     * @return mysqli_result The query data.
     */
    function write_query($query, $hide_errors=0)
    {
        return $this->query($query, $hide_errors, 1);
    }

    /**
     * Explain a query on the database.
     *
     * @param string $string The query SQL.
     * @param string $qtime The time it took to perform the query.
     */
    function explain_query($string, $qtime)
    {
        global $plugins;

        $debug_extra = '';
        if($plugins->current_hook)
        {
            $debug_extra = "<div style=\"float_right\">(Plugin Hook: {$plugins->current_hook})</div>";
        }
        if(preg_match("#^\s*select#i", $string))
        {
            $query = mysqli_query($this->current_link, "EXPLAIN $string");
            $this->explain .= "<table style=\"background-color: #666;\" width=\"95%\" cellpadding=\"4\" cellspacing=\"1\" align=\"center\">\n".
                "<tr>\n".
                "<td colspan=\"8\" style=\"background-color: #ccc;\">{$debug_extra}<div><strong>#".$this->query_count." - Select Query</strong></div></td>\n".
                "</tr>\n".
                "<tr>\n".
                "<td colspan=\"8\" style=\"background-color: #fefefe;\"><span style=\"font-family: Courier; font-size: 14px;\">".htmlspecialchars_uni($string)."</span></td>\n".
                "</tr>\n".
                "<tr style=\"background-color: #efefef;\">\n".
                "<td><strong>Table</strong></td>\n".
                "<td><strong>Type</strong></td>\n".
                "<td><strong>Possible Keys</strong></td>\n".
                "<td><strong>Key</strong></td>\n".
                "<td><strong>Key Length</strong></td>\n".
                "<td><strong>Ref</strong></td>\n".
                "<td><strong>Rows</strong></td>\n".
                "<td><strong>Extra</strong></td>\n".
                "</tr>\n";

            while($table = mysqli_fetch_assoc($query))
            {
                $this->explain .=
                    "<tr bgcolor=\"#ffffff\">\n".
                    "<td>".$table['table']."</td>\n".
                    "<td>".$table['type']."</td>\n".
                    "<td>".$table['possible_keys']."</td>\n".
                    "<td>".$table['key']."</td>\n".
                    "<td>".$table['key_len']."</td>\n".
                    "<td>".$table['ref']."</td>\n".
                    "<td>".$table['rows']."</td>\n".
                    "<td>".$table['Extra']."</td>\n".
                    "</tr>\n";
            }
            $this->explain .=
                "<tr>\n".
                "<td colspan=\"8\" style=\"background-color: #fff;\">Query Time: ".format_time_duration($qtime)."</td>\n".
                "</tr>\n".
                "</table>\n".
                "<br />\n";
        }
        else
        {
            $this->explain .= "<table style=\"background-color: #666;\" width=\"95%\" cellpadding=\"4\" cellspacing=\"1\" align=\"center\">\n".
                "<tr>\n".
                "<td style=\"background-color: #ccc;\">{$debug_extra}<div><strong>#".$this->query_count." - Write Query</strong></div></td>\n".
                "</tr>\n".
                "<tr style=\"background-color: #fefefe;\">\n".
                "<td><span style=\"font-family: Courier; font-size: 14px;\">".htmlspecialchars_uni($string)."</span></td>\n".
                "</tr>\n".
                "<tr>\n".
                "<td bgcolor=\"#ffffff\">Query Time: ".format_time_duration($qtime)."</td>\n".
                "</tr>\n".
                "</table>\n".
                "<br />\n";
        }

        $this->querylist[$this->query_count]['query'] = $string;
        $this->querylist[$this->query_count]['time'] = $qtime;
    }

    /**
     * Return a result array for a query.
     *
     * @param mysqli_result $query The query data.
     * @param int $resulttype The type of array to return. Either MYSQLI_NUM, MYSQLI_BOTH or MYSQLI_ASSOC
     * @return array The array of results.
     */
    function fetch_array($query, $resulttype=MYSQLI_ASSOC)
    {
        switch($resulttype)
        {
            case MYSQLI_NUM:
            case MYSQLI_BOTH:
                break;
            default:
                $resulttype = MYSQLI_ASSOC;
                break;
        }

        $array = mysqli_fetch_array($query, $resulttype);

        return $array;
    }

    /**
     * Return a specific field from a query.
     *
     * @param mysqli_result $query The query ID.
     * @param string $field The name of the field to return.
     * @param int|bool $row The number of the row to fetch it from.
     */
    function fetch_field($query, $field, $row=false)
    {
        if($row !== false)
        {
            $this->data_seek($query, $row);
        }
        $array = $this->fetch_array($query);
        return $array[$field];
    }

    /**
     * Moves internal row pointer to the next row
     *
     * @param mysqli_result $query The query ID.
     * @param int $row The pointer to move the row to.
     * @return bool
     */
    function data_seek($query, $row)
    {
        return mysqli_data_seek($query, $row);
    }

    /**
     * Return the number of rows resulting from a query.
     *
     * @param mysqli_result $query The query data.
     * @return int The number of rows in the result.
     */
    function num_rows($query)
    {
        return mysqli_num_rows($query);
    }

    /**
     * Return the last id number of inserted data.
     *
     * @return int The id number.
     */
    function insert_id()
    {
        $id = mysqli_insert_id($this->current_link);
        return $id;
    }

    /**
     * Close the connection with the DBMS.
     *
     */
    function close()
    {
        @mysqli_close($this->read_link);
        if($this->write_link)
        {
            @mysqli_close($this->write_link);
        }
    }

    /**
     * Return an error number.
     *
     * @return int The error number of the current error.
     */
    function error_number()
    {
        if($this->current_link)
        {
            return mysqli_errno($this->current_link);
        }
        else
        {
            return mysqli_connect_errno();
        }
    }

    /**
     * Return an error string.
     *
     * @return string The explanation for the current error.
     */
    function error_string()
    {
        if($this->current_link)
        {
            return mysqli_error($this->current_link);
        }
        else
        {
            return mysqli_connect_error();
        }
    }

    /**
     * Output a database error.
     *
     * @param string $string The string to present as an error.
     * @return bool Whether error reporting is enabled or not
     */
    function error($string="")
    {
        if($this->error_reporting)
        {
            if(class_exists("errorHandler"))
            {
                global $error_handler;

                if(!is_object($error_handler))
                {
                    require_once MYBB_ROOT."inc/class_error.php";
                    $error_handler = new errorHandler();
                }

                $error = array(
                    "error_no" => $this->error_number(),
                    "error" => $this->error_string(),
                    "query" => $string
                );
                $error_handler->error(MYBB_SQL, $error);
            }
            else
            {
                trigger_error("<strong>[SQL] [".$this->error_number()."] ".$this->error_string()."</strong><br />{$string}", E_USER_ERROR);
            }

            return true;
        }
        else
        {
            return false;
        }
    }

    /**
     * Returns the number of affected rows in a query.
     *
     * @return int The number of affected rows.
     */
    function affected_rows()
    {
        return mysqli_affected_rows($this->current_link);
    }

    /**
     * Return the number of fields.
     *
     * @param mysqli_result $query The query data.
     * @return int The number of fields.
     */
    function num_fields($query)
    {
        return mysqli_num_fields($query);
    }

    /**
     * Lists all tables in the database.
     *
     * @param string $database The database name.
     * @param string $prefix Prefix of the table (optional)
     * @return array The table list.
     */
    function list_tables($database, $prefix='')
    {
        if($prefix)
        {
            $query = $this->query("SHOW TABLES FROM `$database` LIKE '".$this->escape_string($prefix)."%'");
        }
        else
        {
            $query = $this->query("SHOW TABLES FROM `$database`");
        }

        $tables = array();
        while(list($table) = mysqli_fetch_array($query))
        {
            $tables[] = $table;
        }
        return $tables;
    }

    /**
     * Check if a table exists in a database.
     *
     * @param string $table The table name.
     * @return boolean True when exists, false if not.
     */
    function table_exists($table)
    {
        // Execute on master server to ensure if we've just created a table that we get the correct result
        $query = $this->write_query("
			 SHOW TABLES
			LIKE '{$this->table_prefix}$table'
        ");
        $exists = $this->num_rows($query);

        if($exists > 0)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    /**
     * Check if a field exists in a database.
     *
     * @param string $field The field name.
     * @param string $table The table name.
     * @return boolean True when exists, false if not.
     */
    function field_exists($field, $table)
    {
        $query = $this->write_query("
            SHOW COLUMNS
            FROM {$this->table_prefix}$table
            LIKE '$field'
        ");
        $exists = $this->num_rows($query);

        if($exists > 0)
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    /**
     * Add a shutdown query.
     *
     * @param mysqli_result $query The query data.
     * @param string $name An optional name for the query.
     */
    function shutdown_query($query, $name="")
    {
        global $shutdown_queries;
        if($name)
        {
            $shutdown_queries[$name] = $query;
        }
        else
        {
            $shutdown_queries[] = $query;
        }
    }

    /**
     * Performs a simple select query.
     *
     * @param string $table The table name to be queried.
     * @param string $fields Comma delimetered list of fields to be selected.
     * @param string $conditions SQL formatted list of conditions to be matched.
     * @param array $options List of options: group by, order by, order direction, limit, limit start.
     * @return mysqli_result The query data.
     */
    function simple_select($table, $fields="*", $conditions="", $options=array())
    {
        $query = "SELECT ".$fields." FROM ".$this->table_prefix.$table;

        if($conditions != "")
        {
            $query .= " WHERE ".$conditions;
        }

        if(isset($options['group_by']))
        {
            $query .= " GROUP BY ".$options['group_by'];
        }

        if(isset($options['order_by']))
        {
            $query .= " ORDER BY ".$options['order_by'];
            if(isset($options['order_dir']))
            {
                $query .= " ".my_strtoupper($options['order_dir']);
            }
        }

        if(isset($options['limit_start']) && isset($options['limit']))
        {
            $query .= " LIMIT ".$options['limit_start'].", ".$options['limit'];
        }
        else if(isset($options['limit']))
        {
            $query .= " LIMIT ".$options['limit'];
        }

        return $this->query($query);
    }

    /**
     * Build an insert query from an array.
     *
     * @param string $table The table name to perform the query on.
     * @param array $array An array of fields and their values.
     * @return int The insert ID if available
     */
    function insert_query($table, $array)
    {
        global $mybb;

        if(!is_array($array))
        {
            return false;
        }

        foreach($array as $field => $value)
        {
            if(isset($mybb->binary_fields[$table][$field]) && $mybb->binary_fields[$table][$field])
            {
                if($value[0] != 'X') // Not escaped?
                {
                    $value = $this->escape_binary($value);
                }
                
                $array[$field] = $value;
            }
            else
            {
                $array[$field] = $this->quote_val($value);
            }
        }

        $fields = "`".implode("`,`", array_keys($array))."`";
        $values = implode(",", $array);
        $this->write_query("
            INSERT
            INTO {$this->table_prefix}{$table} (".$fields.")
            VALUES (".$values.")
        ");
        return $this->insert_id();
    }

    /**
     * Build one query for multiple inserts from a multidimensional array.
     *
     * @param string $table The table name to perform the query on.
     * @param array $array An array of inserts.
     * @return void
     */
    function insert_query_multiple($table, $array)
    {
        global $mybb;

        if(!is_array($array))
        {
            return;
        }
        // Field names
        $fields = array_keys($array[0]);
        $fields = "`".implode("`,`", $fields)."`";

        $insert_rows = array();
        foreach($array as $values)
        {
            foreach($values as $field => $value)
            {
                if(isset($mybb->binary_fields[$table][$field]) && $mybb->binary_fields[$table][$field])
                {
                    if($value[0] != 'X') // Not escaped?
                    {
                        $value = $this->escape_binary($value);
                    }
                
                    $values[$field] = $value;
                }
                else
                {
                    $values[$field] = $this->quote_val($value);
                }
            }
            $insert_rows[] = "(".implode(",", $values).")";
        }
        $insert_rows = implode(", ", $insert_rows);

        $this->write_query("
            INSERT
            INTO {$this->table_prefix}{$table} ({$fields})
            VALUES {$insert_rows}
        ");
    }

    /**
     * Build an update query from an array.
     *
     * @param string $table The table name to perform the query on.
     * @param array $array An array of fields and their values.
     * @param string $where An optional where clause for the query.
     * @param string $limit An optional limit clause for the query.
     * @param boolean $no_quote An option to quote incoming values of the array.
     * @return mysqli_result The query data.
     */
    function update_query($table, $array, $where="", $limit="", $no_quote=false)
    {
        global $mybb;

        if(!is_array($array))
        {
            return false;
        }

        $comma = "";
        $query = "";
        $quote = "'";

        if($no_quote == true)
        {
            $quote = "";
        }

        foreach($array as $field => $value)
        {
            if(isset($mybb->binary_fields[$table][$field]) && $mybb->binary_fields[$table][$field])
            {
                if($value[0] != 'X') // Not escaped?
                {
                    $value = $this->escape_binary($value);
                }
                
                $query .= $comma."`".$field."`={$value}";
            }
            else
            {
                $quoted_value = $this->quote_val($value, $quote);

                $query .= $comma."`".$field."`={$quoted_value}";
            }
            $comma = ', ';
        }

        if(!empty($where))
        {
            $query .= " WHERE $where";
        }

        if(!empty($limit))
        {
            $query .= " LIMIT $limit";
        }

        return $this->write_query("
            UPDATE {$this->table_prefix}$table
            SET $query
        ");
    }

    /**
     * @param int|string $value
     * @param string $quote
     *
     * @return int|string
     */
    private function quote_val($value, $quote="'")
    {
        if(is_int($value))
        {
            $quoted = $value;
        }
        else
        {
            $quoted = $quote . $value . $quote;
        }

        return $quoted;
    }

    /**
     * Build a delete query.
     *
     * @param string $table The table name to perform the query on.
     * @param string $where An optional where clause for the query.
     * @param string $limit An optional limit clause for the query.
     * @return mysqli_result The query data.
     */
    function delete_query($table, $where="", $limit="")
    {
        $query = "";
        if(!empty($where))
        {
            $query .= " WHERE $where";
        }
        if(!empty($limit))
        {
            $query .= " LIMIT $limit";
        }
        return $this->write_query("DELETE FROM {$this->table_prefix}$table $query");
    }

    /**
     * Escape a string according to the MySQL escape format.
     *
     * @param string $string The string to be escaped.
     * @return string The escaped string.
     */
    function escape_string($string)
    {
        if($this->db_encoding == 'utf8')
        {
            $string = validate_utf8_string($string, false);
        }
        elseif($this->db_encoding == 'utf8mb4')
        {
            $string = validate_utf8_string($string);
        }

        if(function_exists("mysqli_real_escape_string") && $this->read_link)
        {
            $string = mysqli_real_escape_string($this->read_link, $string);
        }
        else
        {
            $string = addslashes($string);
        }
        return $string;
    }

    /**
     * Frees the resources of a MySQLi query.
     *
     * @param mysqli_result $query The query to destroy.
     * @return boolean Returns true
     */
    function free_result($query)
    {
        mysqli_free_result($query);
        return true; // Kept for compatibility reasons
    }

    /**
     * Escape a string used within a like command.
     *
     * @param string $string The string to be escaped.
     * @return string The escaped string.
     */
    function escape_string_like($string)
    {
        return $this->escape_string(str_replace(array('%', '_') , array('\\%' , '\\_') , $string));
    }

    /**
     * Gets the current version of MySQL.
     *
     * @return string Version of MySQL.
     */
    function get_version()
    {
        if($this->version)
        {
            return $this->version;
        }

        $version = @mysqli_get_server_info($this->read_link);
        if(!$version)
        {
            $query = $this->query("SELECT VERSION() as version");
            $ver = $this->fetch_array($query);
            $version = $ver['version'];
        }

        if($version)
        {
            $version = explode(".", $version, 3);
            $this->version = (int)$version[0].".".(int)$version[1].".".(int)$version[2];
        }
        return $this->version;
    }

    /**
     * Optimizes a specific table.
     *
     * @param string $table The name of the table to be optimized.
     */
    function optimize_table($table)
    {
        $this->write_query("OPTIMIZE TABLE ".$this->table_prefix.$table."");
    }

    /**
     * Analyzes a specific table.
     *
     * @param string $table The name of the table to be analyzed.
     */
    function analyze_table($table)
    {
        $this->write_query("ANALYZE TABLE ".$this->table_prefix.$table."");
    }

    /**
     * Show the "create table" command for a specific table.
     *
     * @param string $table The name of the table.
     * @return string The MySQL command to create the specified table.
     */
    function show_create_table($table)
    {
        $query = $this->write_query("SHOW CREATE TABLE ".$this->table_prefix.$table."");
        $structure = $this->fetch_array($query);

        return $structure['Create Table'];
    }

    /**
     * Show the "show fields from" command for a specific table.
     *
     * @param string $table The name of the table.
     * @return array Field info for that table
     */
    function show_fields_from($table)
    {
        $query = $this->write_query("SHOW FIELDS FROM ".$this->table_prefix.$table."");
        $field_info = array();
        while($field = $this->fetch_array($query))
        {
            $field_info[] = $field;
        }
        return $field_info;
    }

    /**
     * Returns whether or not the table contains a fulltext index.
     *
     * @param string $table The name of the table.
     * @param string $index Optionally specify the name of the index.
     * @return boolean True or false if the table has a fulltext index or not.
     */
    function is_fulltext($table, $index="")
    {
        $structure = $this->show_create_table($table);
        if($index != "")
        {
            if(preg_match("#FULLTEXT KEY (`?)$index(`?)#i", $structure))
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        if(preg_match('#FULLTEXT KEY#i', $structure))
        {
            return true;
        }
        return false;
    }

    /**
     * Returns whether or not this database engine supports fulltext indexing.
     *
     * @param string $table The table to be checked.
     * @return boolean True or false if supported or not.
     */

    function supports_fulltext($table)
    {
        $version = $this->get_version();
        $query = $this->write_query("SHOW TABLE STATUS LIKE '{$this->table_prefix}$table'");
        $status = $this->fetch_array($query);
        $table_type = my_strtoupper($status['Engine']);
        if(version_compare($version, '3.23.23', '>=') && ($table_type == 'MYISAM' || $table_type == 'ARIA'))
        {
            return true;
        }
        elseif(version_compare($version, '5.6', '>=') && $table_type == 'INNODB')
        {
            return true;
        }
        return false;
    }

    /**
     * Returns whether or not this database engine supports boolean fulltext matching.
     *
     * @param string $table The table to be checked.
     * @return boolean True or false if supported or not.
     */
    function supports_fulltext_boolean($table)
    {
        $version = $this->get_version();
        $supports_fulltext = $this->supports_fulltext($table);
        if(version_compare($version, '4.0.1', '>=') && $supports_fulltext == true)
        {
            return true;
        }
        return false;
    }

    /**
     * Checks to see if an index exists on a specified table
     *
     * @param string $table The name of the table.
     * @param string $index The name of the index.
     * @return bool Returns whether index exists
     */
    function index_exists($table, $index)
    {
        $index_exists = false;
        $query = $this->write_query("SHOW INDEX FROM {$this->table_prefix}{$table}");
        while($ukey = $this->fetch_array($query))
        {
            if($ukey['Key_name'] == $index)
            {
                $index_exists = true;
                break;
            }
        }

        if($index_exists)
        {
            return true;
        }

        return false;
    }

    /**
     * Creates a fulltext index on the specified column in the specified table with optional index name.
     *
     * @param string $table The name of the table.
     * @param string $column Name of the column to be indexed.
     * @param string $name The index name, optional.
     */
    function create_fulltext_index($table, $column, $name="")
    {
        $this->write_query("ALTER TABLE {$this->table_prefix}$table ADD FULLTEXT $name ($column)");
    }

    /**
     * Drop an index with the specified name from the specified table
     *
     * @param string $table The name of the table.
     * @param string $name The name of the index.
     */
    function drop_index($table, $name)
    {
        $this->write_query("ALTER TABLE {$this->table_prefix}$table DROP INDEX $name");
    }

    /**
     * Drop an table with the specified table
     *
     * @param string $table The table to drop
     * @param boolean $hard hard drop - no checking
     * @param boolean $table_prefix use table prefix
     */
    function drop_table($table, $hard=false, $table_prefix=true)
    {
        if($table_prefix == false)
        {
            $table_prefix = "";
        }
        else
        {
            $table_prefix = $this->table_prefix;
        }

        if($hard == false)
        {
            $this->write_query('DROP TABLE IF EXISTS '.$table_prefix.$table);
        }
        else
        {
            $this->write_query('DROP TABLE '.$table_prefix.$table);
        }
    }

    /**
     * Renames a table
     *
     * @param string $old_table The old table name
     * @param string $new_table the new table name
     * @param boolean $table_prefix use table prefix
     * @return mysqli_result
     */
    function rename_table($old_table, $new_table, $table_prefix=true)
    {
        if($table_prefix == false)
        {
            $table_prefix = "";
        }
        else
        {
            $table_prefix = $this->table_prefix;
        }

        return $this->write_query("RENAME TABLE {$table_prefix}{$old_table} TO {$table_prefix}{$new_table}");
    }

    /**
     * Replace contents of table with values
     *
     * @param string $table The table
     * @param array $replacements The replacements
     * @return mysqli_result|bool
     */
    function replace_query($table, $replacements=array())
    {
        global $mybb;

        $values = '';
        $comma = '';
        foreach($replacements as $column => $value)
        {
            if(isset($mybb->binary_fields[$table][$column]) && $mybb->binary_fields[$table][$column])
            {
                if($value[0] != 'X') // Not escaped?
                {
                    $value = $this->escape_binary($value);
                }
                
                $values .= $comma."`".$column."`=".$value;
            }
            else
            {
                $values .= $comma."`".$column."`=".$this->quote_val($value);
            }

            $comma = ',';
        }

        if(empty($replacements))
        {
             return false;
        }

        return $this->write_query("REPLACE INTO {$this->table_prefix}{$table} SET {$values}");
    }

    /**
     * Drops a column
     *
     * @param string $table The table
     * @param string $column The column name
     * @return mysqli_result
     */
    function drop_column($table, $column)
    {
        return $this->write_query("ALTER TABLE {$this->table_prefix}{$table} DROP {$column}");
    }

    /**
     * Adds a column
     *
     * @param string $table The table
     * @param string $column The column name
     * @param string $definition the new column definition
     * @return mysqli_result
     */
    function add_column($table, $column, $definition)
    {
        return $this->write_query("ALTER TABLE {$this->table_prefix}{$table} ADD {$column} {$definition}");
    }

    /**
     * Modifies a column
     *
     * @param string $table The table
     * @param string $column The column name
     * @param string $new_definition the new column definition
     * @return mysqli_result
     */
    function modify_column($table, $column, $new_definition)
    {
        return $this->write_query("ALTER TABLE {$this->table_prefix}{$table} MODIFY {$column} {$new_definition}");
    }

    /**
     * Renames a column
     *
     * @param string $table The table
     * @param string $old_column The old column name
     * @param string $new_column the new column name
     * @param string $new_definition the new column definition
     * @return mysqli_result
     */
    function rename_column($table, $old_column, $new_column, $new_definition)
    {
        return $this->write_query("ALTER TABLE {$this->table_prefix}{$table} CHANGE {$old_column} {$new_column} {$new_definition}");
    }

    /**
     * Sets the table prefix used by the simple select, insert, update and delete functions
     *
     * @param string $prefix The new table prefix
     */
    function set_table_prefix($prefix)
    {
        $this->table_prefix = $prefix;
    }

    /**
     * Fetched the total size of all mysql tables or a specific table
     *
     * @param string $table The table (optional)
     * @return integer the total size of all mysql tables or a specific table
     */
    function fetch_size($table='')
    {
        if($table != '')
        {
            $query = $this->query("SHOW TABLE STATUS LIKE '".$this->table_prefix.$table."'");
        }
        else
        {
            $query = $this->query("SHOW TABLE STATUS");
        }
        $total = 0;
        while($table = $this->fetch_array($query))
        {
            $total += $table['Data_length']+$table['Index_length'];
        }
        return $total;
    }

    /**
     * Fetch a list of database character sets this DBMS supports
     *
     * @return array|bool Array of supported character sets with array key being the name, array value being display name. False if unsupported
     */
    function fetch_db_charsets()
    {
        if($this->write_link && version_compare($this->get_version(), "4.1", "<"))
        {
            return false;
        }
        return array(
            'big5' => 'Big5 Traditional Chinese',
            'dec8' => 'DEC West European',
            'cp850' => 'DOS West European',
            'hp8' => 'HP West European',
            'koi8r' => 'KOI8-R Relcom Russian',
            'latin1' => 'ISO 8859-1 Latin 1',
            'latin2' => 'ISO 8859-2 Central European',
            'swe7' => '7bit Swedish',
            'ascii' => 'US ASCII',
            'ujis' => 'EUC-JP Japanese',
            'sjis' => 'Shift-JIS Japanese',
            'hebrew' => 'ISO 8859-8 Hebrew',
            'tis620' => 'TIS620 Thai',
            'euckr' => 'EUC-KR Korean',
            'koi8u' => 'KOI8-U Ukrainian',
            'gb2312' => 'GB2312 Simplified Chinese',
            'greek' => 'ISO 8859-7 Greek',
            'cp1250' => 'Windows Central European',
            'gbk' => 'GBK Simplified Chinese',
            'latin5' => 'ISO 8859-9 Turkish',
            'armscii8' => 'ARMSCII-8 Armenian',
            'utf8' => 'UTF-8 Unicode',
            'utf8mb4' => '4-Byte UTF-8 Unicode (requires MySQL 5.5.3 or above)',
            'ucs2' => 'UCS-2 Unicode',
            'cp866' => 'DOS Russian',
            'keybcs2' => 'DOS Kamenicky Czech-Slovak',
            'macce' => 'Mac Central European',
            'macroman' => 'Mac West European',
            'cp852' => 'DOS Central European',
            'latin7' => 'ISO 8859-13 Baltic',
            'cp1251' => 'Windows Cyrillic',
            'cp1256' => 'Windows Arabic',
            'cp1257' => 'Windows Baltic',
            'binary' => 'Binary pseudo charset',
            'geostd8' => 'GEOSTD8 Georgian',
            'cp932' => 'SJIS for Windows Japanese',
            'eucjpms' => 'UJIS for Windows Japanese',
        );
    }

    /**
     * Fetch a database collation for a particular database character set
     *
     * @param string $charset The database character set
     * @return string|bool The matching database collation, false if unsupported
     */
    function fetch_charset_collation($charset)
    {
        $collations = array(
            'big5' => 'big5_chinese_ci',
            'dec8' => 'dec8_swedish_ci',
            'cp850' => 'cp850_general_ci',
            'hp8' => 'hp8_english_ci',
            'koi8r' => 'koi8r_general_ci',
            'latin1' => 'latin1_swedish_ci',
            'latin2' => 'latin2_general_ci',
            'swe7' => 'swe7_swedish_ci',
            'ascii' => 'ascii_general_ci',
            'ujis' => 'ujis_japanese_ci',
            'sjis' => 'sjis_japanese_ci',
            'hebrew' => 'hebrew_general_ci',
            'tis620' => 'tis620_thai_ci',
            'euckr' => 'euckr_korean_ci',
            'koi8u' => 'koi8u_general_ci',
            'gb2312' => 'gb2312_chinese_ci',
            'greek' => 'greek_general_ci',
            'cp1250' => 'cp1250_general_ci',
            'gbk' => 'gbk_chinese_ci',
            'latin5' => 'latin5_turkish_ci',
            'armscii8' => 'armscii8_general_ci',
            'utf8' => 'utf8_general_ci',
            'utf8mb4' => 'utf8mb4_general_ci',
            'ucs2' => 'ucs2_general_ci',
            'cp866' => 'cp866_general_ci',
            'keybcs2' => 'keybcs2_general_ci',
            'macce' => 'macce_general_ci',
            'macroman' => 'macroman_general_ci',
            'cp852' => 'cp852_general_ci',
            'latin7' => 'latin7_general_ci',
            'cp1251' => 'cp1251_general_ci',
            'cp1256' => 'cp1256_general_ci',
            'cp1257' => 'cp1257_general_ci',
            'binary' => 'binary',
            'geostd8' => 'geostd8_general_ci',
            'cp932' => 'cp932_japanese_ci',
            'eucjpms' => 'eucjpms_japanese_ci',
        );
        if($collations[$charset])
        {
            return $collations[$charset];
        }
        return false;
    }

    /**
     * Fetch a character set/collation string for use with CREATE TABLE statements. Uses current DB encoding
     *
     * @return string The built string, empty if unsupported
     */
    function build_create_table_collation()
    {
        if(!$this->db_encoding)
        {
            return '';
        }

        $collation = $this->fetch_charset_collation($this->db_encoding);
        if(!$collation)
        {
            return '';
        }
        return " CHARACTER SET {$this->db_encoding} COLLATE {$collation}";
    }

    /**
     * Time how long it takes for a particular piece of code to run. Place calls above & below the block of code.
     *
     * @deprecated
     */
    function get_execution_time()
    {
        return get_execution_time();
    }

    /**
     * Binary database fields require special attention.
     *
     * @param string $string Binary value
     * @return string Encoded binary value
     */
    function escape_binary($string)
    {
        return "X'".$this->escape_string(bin2hex($string))."'";
    }

    /**
     * Unescape binary data.
     *
     * @param string $string Binary value
     * @return string Encoded binary value
     */
    function unescape_binary($string)
    {
        // Nothing to do
        return $string;
    }
} 
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RE: Problem after update to MyBB 1.8.6 (from 1.8.5) - by Destroy666 - 2016-01-16, 03:06 PM

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