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I can no longer post after upgrade from 1.6.15 to 1.8.  Also note, I have no plugins activated.

Doesn't matter if there are attachments or no attachments.

Here is what I am getting:

The following warnings occurred:
Warning [2] preg_match() expects parameter 2 to be string, array given - Line: 7631 - File: inc/functions.php PHP 5.2.17 (Linux)

File                                                      Line                                         Function
[PHP]                                                                                            errorHandler->error
/inc/functions.php                              7631                                    preg_match
/inc/db_mysqli.php                              955                                    validate_utf8_string
/newthread.php                                      175                                    DB_MySQLi->escape_string

Please correct the following errors before continuing:
The file upload failed. Please choose a valid file and try again. Error details: PHP returned error code: Array. Please contact your forum administrator with this error.

I have checked my attachment types and they are intact.  This error happens even when I have no attachments.

Any ideas?

For the record, thanks for everyone who contributes to these forums.  I have learned a ton.
Run File Verification in ACP -> Tools & Maintenance and show the result screen here. Also include you newthread.php file in [php] tags.
File Verification: No Problems Detected
File Status
Congratulations! No corrupt files have been found on your installation.



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

define("IN_MYBB", 1);
define('THIS_SCRIPT', 'newthread.php');

$templatelist = "newthread,previewpost,loginbox,changeuserbox,newthread_postpoll,posticons,codebuttons,smilieinsert,newthread_multiquote_external,post_attachments_attachment_unapproved,newthread_disablesmilies_hidden";
$templatelist .= ",newthread_disablesmilies,newreply_modoptions,post_attachments_new,post_attachments,post_savedraftbutton,post_subscription_method,post_attachments_attachment_remove,posticons_icon,postbit_warninglevel_formatted";
$templatelist .= ",forumdisplay_rules,forumdisplay_rules_link,post_attachments_attachment_postinsert,post_attachments_attachment,post_attachments_add,newthread_options_signature,post_prefixselect_prefix,post_prefixselect_single";
$templatelist .= ",member_register_regimage,member_register_regimage_recaptcha,member_register_regimage_ayah,post_captcha_hidden,post_captcha,post_captcha_recaptcha,post_captcha_ayah,postbit_groupimage,postbit_online,postbit_away";
$templatelist .= ",postbit_avatar,postbit_find,postbit_pm,postbit_rep_button,postbit_www,postbit_email,postbit_reputation,postbit_warn,postbit_warninglevel,postbit_author_user,postbit_author_guest,postbit_offline";
$templatelist .= ",postbit_signature,postbit_classic,postbit,postbit_attachments_thumbnails_thumbnail,postbit_attachments_images_image,postbit_attachments_attachment,postbit_attachments_attachment_unapproved,post_attachments_update";
$templatelist .= ",postbit_attachments_thumbnails,postbit_attachments_images,postbit_attachments,postbit_gotopost,smilieinsert_getmore,smilieinsert_smilie,smilieinsert_smilie_empty,attachment_icon,postbit_reputation_formatted_link,global_moderation_notice";

require_once "./global.php";
require_once MYBB_ROOT."inc/functions_post.php";
require_once MYBB_ROOT."inc/functions_user.php";

// Load global language phrases
$lang->load("newthread");

$tid = $pid = 0;
$mybb->input['action'] = $mybb->get_input('action');
$mybb->input['tid'] = $mybb->get_input('tid', 1);
$mybb->input['pid'] = $mybb->get_input('pid', 1);
if($mybb->input['action'] == "editdraft" || ($mybb->get_input('savedraft') && $mybb->input['tid']) || ($mybb->input['tid'] && $mybb->input['pid']))
{
 $thread = get_thread($mybb->input['tid']);

 $query = $db->simple_select("posts", "*", "tid='".$mybb->get_input('tid', 1)."' AND visible='-2'", array('order_by' => 'dateline', 'limit' => 1));
 $post = $db->fetch_array($query);

 if(!$thread['tid'] || !$post['pid'] || $thread['visible'] != -2 || $thread['uid'] != $mybb->user['uid'])
 {
 error($lang->invalidthread);
 }

 $pid = $post['pid'];
 $fid = $thread['fid'];
 $tid = $thread['tid'];
 $editdraftpid = "<input type=\"hidden\" name=\"pid\" value=\"$pid\" />";
}
else
{
 $fid = $mybb->get_input('fid', 1);
 $editdraftpid = '';
}

// Fetch forum information.
$forum = get_forum($fid);
if(!$forum)
{
 error($lang->error_invalidforum);
}

// Draw the navigation
build_forum_breadcrumb($fid);
add_breadcrumb($lang->nav_newthread);

$forumpermissions = forum_permissions($fid);

if($forum['open'] == 0 || $forum['type'] != "f" || $forum['linkto'] != "")
{
 error($lang->error_closedinvalidforum);
}

if($forumpermissions['canview'] == 0 || $forumpermissions['canpostthreads'] == 0)
{
 error_no_permission();
}

if($mybb->user['suspendposting'] == 1)
{
 $suspendedpostingtype = $lang->error_suspendedposting_permanent;
 if($mybb->user['suspensiontime'])
 {
 $suspendedpostingtype = $lang->sprintf($lang->error_suspendedposting_temporal, my_date($mybb->settings['dateformat'], $mybb->user['suspensiontime']));
 }

 $lang->error_suspendedposting = $lang->sprintf($lang->error_suspendedposting, $suspendedpostingtype, my_date($mybb->settings['timeformat'], $mybb->user['suspensiontime']));

 error($lang->error_suspendedposting);
}

// Check if this forum is password protected and we have a valid password
check_forum_password($forum['fid']);

// If MyCode is on for this forum and the MyCode editor is enabled in the Admin CP, draw the code buttons and smilie inserter.
if($mybb->settings['bbcodeinserter'] != 0 && $forum['allowmycode'] != 0 && (!$mybb->user['uid'] || $mybb->user['showcodebuttons'] != 0))
{
 $codebuttons = build_mycode_inserter("message", $forum['allowsmilies']);
 if($forum['allowsmilies'] != 0)
 {
 $smilieinserter = build_clickable_smilies();
 }
}

// Does this forum allow post icons? If so, fetch the post icons.
if($forum['allowpicons'] != 0)
{
 $posticons = get_post_icons();
}

// If we have a currently logged in user then fetch the change user box.
if($mybb->user['uid'] != 0)
{
 eval("\$loginbox = \"".$templates->get("changeuserbox")."\";");
}

// Otherwise we have a guest, determine the "username" and get the login box.
else
{
 if(!isset($mybb->input['previewpost']) && $mybb->input['action'] != "do_newthread")
 {
 $username = '';
 }
 else
 {
 $username = htmlspecialchars_uni($mybb->get_input('username'));
 }
 eval("\$loginbox = \"".$templates->get("loginbox")."\";");
}

// If we're not performing a new thread insert and not editing a draft then we're posting a new thread.
if($mybb->input['action'] != "do_newthread" && $mybb->input['action'] != "editdraft")
{
 $mybb->input['action'] = "newthread";
}

// Previewing a post, overwrite the action to the new thread action.
if(!empty($mybb->input['previewpost']))
{
 $mybb->input['action'] = "newthread";
}

// Setup a unique posthash for attachment management
if(!$mybb->get_input('posthash') && !$pid)
{
 $mybb->input['posthash'] = md5($mybb->user['uid'].random_str());
}

if((empty($_POST) && empty($_FILES)) && $mybb->get_input('processed', 1) == 1)
{
 error($lang->error_cannot_upload_php_post);
}

$errors = array();
$maximageserror = $attacherror = '';

// Handle attachments if we've got any.
if($mybb->settings['enableattachments'] == 1 && !$mybb->get_input('attachmentaid', 1) && ($mybb->get_input('newattachment') || $mybb->get_input('updateattachment') || ($mybb->input['action'] == "do_newthread" && $mybb->get_input('submit') && $_FILES['attachment'])))
{
 // Verify incoming POST request
 verify_post_check($mybb->get_input('my_post_key'));

 if($mybb->input['action'] == "editdraft" || ($mybb->input['tid'] && $mybb->input['pid']))
 {
 $attachwhere = "pid='{$pid}'";
 }
 else
 {
 $attachwhere = "posthash='".$db->escape_string($mybb->get_input('posthash'))."'";
 }

 // If there's an attachment, check it and upload it
 if($_FILES['attachment']['size'] > 0 && $forumpermissions['canpostattachments'] != 0)
 {
 $query = $db->simple_select("attachments", "aid", "filename='".$db->escape_string($_FILES['attachment']['name'])."' AND {$attachwhere}");
 $updateattach = $db->fetch_field($query, "aid");

 require_once MYBB_ROOT."inc/functions_upload.php";

 $update_attachment = false;
 if($updateattach > 0 && $mybb->get_input('updateattachment'))
 {
 $update_attachment = true;
 }
 $attachedfile = upload_attachment($_FILES['attachment'], $update_attachment);
 }

 // Error with attachments - should use new inline errors?
 if(!empty($attachedfile['error']))
 {
 $errors[] = $attachedfile['error'];
 $mybb->input['action'] = "newthread";
 }

 // If we were dealing with an attachment but didn't click 'Post Thread', force the new thread page again.
 if(!$mybb->get_input('submit'))
 {
 //$editdraftpid = "<input type=\"hidden\" name=\"pid\" value=\"$pid\" />";
 $mybb->input['action'] = "newthread";
 }
}

// Are we removing an attachment from the thread?
if($mybb->settings['enableattachments'] == 1 && $mybb->get_input('attachmentaid', 1) && $mybb->get_input('attachmentact') == "remove")
{
 // Verify incoming POST request
 verify_post_check($mybb->get_input('my_post_key'));

 require_once MYBB_ROOT."inc/functions_upload.php";
 remove_attachment($pid, $mybb->get_input('posthash'), $mybb->get_input('attachmentaid', 1));
 if(!$mybb->get_input('submit'))
 {
 $mybb->input['action'] = "newthread";
 }
}

$thread_errors = "";
$hide_captcha = false;

// Check the maximum posts per day for this user
if($mybb->usergroup['maxposts'] > 0 && $mybb->usergroup['cancp'] != 1)
{
 $daycut = TIME_NOW-60*60*24;
 $query = $db->simple_select("posts", "COUNT(*) AS posts_today", "uid='{$mybb->user['uid']}' AND visible='1' AND dateline>{$daycut}");
 $post_count = $db->fetch_field($query, "posts_today");
 if($post_count >= $mybb->usergroup['maxposts'])
 {
 $lang->error_maxposts = $lang->sprintf($lang->error_maxposts, $mybb->usergroup['maxposts']);
 error($lang->error_maxposts);
 }
}

// Performing the posting of a new thread.
if($mybb->input['action'] == "do_newthread" && $mybb->request_method == "post")
{
 // Verify incoming POST request
 verify_post_check($mybb->get_input('my_post_key'));

 $plugins->run_hooks("newthread_do_newthread_start");

 // If this isn't a logged in user, then we need to do some special validation.
 if($mybb->user['uid'] == 0)
 {
 $username = htmlspecialchars_uni($mybb->get_input('username'));

 // Check if username exists.
 if(username_exists($mybb->get_input('username')))
 {
 // If it does throw back "username is taken"
 error($lang->error_usernametaken);
 }
 // This username does not exist.
 else
 {
 // If they didn't specify a username then give them "Guest"
 if(!$mybb->get_input('username'))
 {
 $username = $lang->guest;
 }
 // Otherwise use the name they specified.
 else
 {
 $username = htmlspecialchars_uni($mybb->get_input('username'));
 }
 $uid = 0;
 }

 if(!$mybb->user['uid'] && $mybb->settings['stopforumspam_on_newthread'])
 {
 require_once MYBB_ROOT . '/inc/class_stopforumspamchecker.php';

 $stop_forum_spam_checker = new StopForumSpamChecker(
 $plugins,
 $mybb->settings['stopforumspam_min_weighting_before_spam'],
 $mybb->settings['stopforumspam_check_usernames'],
 $mybb->settings['stopforumspam_check_emails'],
 $mybb->settings['stopforumspam_check_ips'],
 $mybb->settings['stopforumspam_log_blocks']
 );

 try {
 if($stop_forum_spam_checker->is_user_a_spammer($mybb->get_input('username'), '', get_ip()))
 {
 $errors[] = $lang->error_stop_forum_spam_spammer;
 }
 }
 catch (Exception $e)
 {
 if($mybb->settings['stopforumspam_block_on_error'])
 {
 $errors[] = $lang->error_stop_forum_spam_fetching;
 }
 }
 }
 }
 // This user is logged in.
 else
 {
 $username = $mybb->user['username'];
 $uid = $mybb->user['uid'];
 }

 // Attempt to see if this post is a duplicate or not
 if($uid > 0)
 {
 $user_check = "p.uid='{$uid}'";
 }
 else
 {
 $user_check = "p.ipaddress=".$db->escape_binary($session->packedip);
 }
 if(!$mybb->get_input('savedraft') && !$pid)
 {
 $query = $db->simple_select("posts p", "p.pid", "$user_check AND p.fid='{$forum['fid']}' AND p.subject='".$db->escape_string($mybb->get_input('subject'))."' AND p.message='".$db->escape_string($mybb->get_input('message'))."' AND p.dateline>".(TIME_NOW-600));
 $duplicate_check = $db->fetch_field($query, "pid");
 if($duplicate_check)
 {
 error($lang->error_post_already_submitted);
 }
 }

 // Set up posthandler.
 require_once MYBB_ROOT."inc/datahandlers/post.php";
 $posthandler = new PostDataHandler("insert");
 $posthandler->action = "thread";

 // Set the thread data that came from the input to the $thread array.
 $new_thread = array(
 "fid" => $forum['fid'],
 "subject" => $mybb->get_input('subject'),
 "prefix" => $mybb->get_input('threadprefix', 1),
 "icon" => $mybb->get_input('icon', 1),
 "uid" => $uid,
 "username" => $username,
 "message" => $mybb->get_input('message'),
 "ipaddress" => $session->packedip,
 "posthash" => $mybb->get_input('posthash')
 );

 if($pid != '')
 {
 $new_thread['pid'] = $pid;
 }

 // Are we saving a draft thread?
 if($mybb->get_input('savedraft') && $mybb->user['uid'])
 {
 $new_thread['savedraft'] = 1;
 }
 else
 {
 $new_thread['savedraft'] = 0;
 }

 // Is this thread already a draft and we're updating it?
 if(isset($thread['tid']) && $thread['visible'] == -2)
 {
 $new_thread['tid'] = $thread['tid'];
 }

 $postoptions = $mybb->get_input('postoptions', 2);
 if(!isset($postoptions['signature']))
 {
 $postoptions['signature'] = 0;
 }
 if(!isset($postoptions['subscriptionmethod']))
 {
 $postoptions['subscriptionmethod'] = 0;
 }
 if(!isset($postoptions['disablesmilies']))
 {
 $postoptions['disablesmilies'] = 0;
 }

 // Set up the thread options from the input.
 $new_thread['options'] = array(
 "signature" => $postoptions['signature'],
 "subscriptionmethod" => $postoptions['subscriptionmethod'],
 "disablesmilies" => $postoptions['disablesmilies']
 );

 // Apply moderation options if we have them
 $new_thread['modoptions'] = $mybb->get_input('modoptions', 2);

 $posthandler->set_data($new_thread);

 // Now let the post handler do all the hard work.
 $valid_thread = $posthandler->validate_thread();

 $post_errors = array();
 // Fetch friendly error messages if this is an invalid thread
 if(!$valid_thread)
 {
 $post_errors = $posthandler->get_friendly_errors();
 }

 // Check captcha image
 if($mybb->settings['captchaimage'] && !$mybb->user['uid'])
 {
 require_once MYBB_ROOT.'inc/class_captcha.php';
 $post_captcha = new captcha;

 if($post_captcha->validate_captcha() == false)
 {
 // CAPTCHA validation failed
 foreach($post_captcha->get_errors() as $error)
 {
 $post_errors[] = $error;
 }
 }
 else
 {
 $hide_captcha = true;
 }
 }

 // One or more errors returned, fetch error list and throw to newthread page
 if(count($post_errors) > 0)
 {
 $thread_errors = inline_error($post_errors);
 $mybb->input['action'] = "newthread";
 }
 // No errors were found, it is safe to insert the thread.
 else
 {
 $thread_info = $posthandler->insert_thread();
 $tid = $thread_info['tid'];
 $visible = $thread_info['visible'];

 // Invalidate solved captcha
 if($mybb->settings['captchaimage'] && !$mybb->user['uid'])
 {
 $post_captcha->invalidate_captcha();
 }

 $force_redirect = false;

 // Mark thread as read
 require_once MYBB_ROOT."inc/functions_indicators.php";
 mark_thread_read($tid, $fid);

 // We were updating a draft thread, send them back to the draft listing.
 if($new_thread['savedraft'] == 1)
 {
 $lang->redirect_newthread = $lang->draft_saved;
 $url = "usercp.php?action=drafts";
 }

 // A poll was being posted with this thread, throw them to poll posting page.
 else if($mybb->get_input('postpoll', 1) && $forumpermissions['canpostpolls'])
 {
 $url = "polls.php?action=newpoll&tid=$tid&polloptions=".$mybb->get_input('numpolloptions', 1);
 $lang->redirect_newthread .= $lang->redirect_newthread_poll;
 }

 // This thread is stuck in the moderation queue, send them back to the forum.
 else if(!$visible)
 {
 // Moderated thread
 $lang->redirect_newthread .= $lang->redirect_newthread_moderation;
 $url = get_forum_link($fid);

 // User must see moderation notice, regardless of redirect settings
 $force_redirect = true;
 }

 // This is just a normal thread - send them to it.
 else
 {
 // Visible thread
 $lang->redirect_newthread .= $lang->redirect_newthread_thread;
 $url = get_thread_link($tid);
 }

 // Mark any quoted posts so they're no longer selected - attempts to maintain those which weren't selected
 if(isset($mybb->input['quoted_ids']) && isset($mybb->cookies['multiquote']) && $mybb->settings['multiquote'] != 0)
 {
 // We quoted all posts - remove the entire cookie
 if($mybb->get_input('quoted_ids') == "all")
 {
 my_unsetcookie("multiquote");
 }
 }

 $plugins->run_hooks("newthread_do_newthread_end");

 // Hop to it! Send them to the next page.
 if(!$mybb->get_input('postpoll', 1))
 {
 $lang->redirect_newthread .= $lang->sprintf($lang->redirect_return_forum, get_forum_link($fid));
 }
 redirect($url, $lang->redirect_newthread, "", $force_redirect);
 }
}

if($mybb->input['action'] == "newthread" || $mybb->input['action'] == "editdraft")
{
 $plugins->run_hooks("newthread_start");

 // Do we have attachment errors?
 if(count($errors) > 0)
 {
 $thread_errors = inline_error($errors);
 }

 $multiquote_external = $quoted_ids = '';

 $subject = $message = '';
 // If this isn't a preview and we're not editing a draft, then handle quoted posts
 if(empty($mybb->input['previewpost']) && !$thread_errors && $mybb->input['action'] != "editdraft")
 {
 $quoted_posts = array();
 // Handle multiquote
 if(isset($mybb->cookies['multiquote']) && $mybb->settings['multiquote'] != 0)
 {
 $multiquoted = explode("|", $mybb->cookies['multiquote']);
 foreach($multiquoted as $post)
 {
 $quoted_posts[$post] = (int)$post;
 }
 }

 // Quoting more than one post - fetch them
 if(count($quoted_posts) > 0)
 {
 $external_quotes = 0;
 $quoted_posts = implode(",", $quoted_posts);
 $unviewable_forums = get_unviewable_forums();
 $inactiveforums = get_inactive_forums();
 if($unviewable_forums)
 {
 $unviewable_forums = "AND t.fid NOT IN ({$unviewable_forums})";
 }
 if($inactiveforums)
 {
 $inactiveforums = "AND t.fid NOT IN ({$inactiveforums})";
 }

 if(is_moderator($fid))
 {
 $visible_where = "AND p.visible != 2";
 }
 else
 {
 $visible_where = "AND p.visible > 0";
 }

 if($mybb->get_input('load_all_quotes', 1) == 1)
 {
 $query = $db->query("
 SELECT p.subject, p.message, p.pid, p.tid, p.username, p.dateline, u.username AS userusername
 FROM ".TABLE_PREFIX."posts p
 LEFT JOIN ".TABLE_PREFIX."threads t ON (t.tid=p.tid)
 LEFT JOIN ".TABLE_PREFIX."users u ON (u.uid=p.uid)
 WHERE p.pid IN ({$quoted_posts}) {$unviewable_forums} {$inactiveforums} {$visible_where}
 ORDER BY p.dateline
 ");
 while($quoted_post = $db->fetch_array($query))
 {
 if($quoted_post['userusername'])
 {
 $quoted_post['username'] = $quoted_post['userusername'];
 }
 $quoted_post['message'] = preg_replace('#(^|\r|\n)/me ([^\r\n<]*)#i', "\\1* {$quoted_post['username']} \\2", $quoted_post['message']);
 $quoted_post['message'] = preg_replace('#(^|\r|\n)/slap ([^\r\n<]*)#i', "\\1* {$quoted_post['username']} {$lang->slaps} \\2 {$lang->with_trout}", $quoted_post['message']);
 $quoted_post['message'] = preg_replace("#\[attachment=([0-9]+?)\]#i", '', $quoted_post['message']);
 $message .= "[quote='{$quoted_post['username']}' pid='{$quoted_post['pid']}' dateline='{$quoted_post['dateline']}']\n{$quoted_post['message']}\n[/quote]\n\n";
 }

 $quoted_ids = "all";
 }
 else
 {
 $query = $db->query("
 SELECT COUNT(*) AS quotes
 FROM ".TABLE_PREFIX."posts p
 LEFT JOIN ".TABLE_PREFIX."threads t ON (t.tid=p.tid)
 WHERE p.pid IN ({$quoted_posts}) {$unviewable_forums} {$inactiveforums} {$visible_where}
 ");
 $external_quotes = $db->fetch_field($query, 'quotes');

 if($external_quotes > 0)
 {
 if($external_quotes == 1)
 {
 $multiquote_text = $lang->multiquote_external_one;
 $multiquote_deselect = $lang->multiquote_external_one_deselect;
 $multiquote_quote = $lang->multiquote_external_one_quote;
 }
 else
 {
 $multiquote_text = $lang->sprintf($lang->multiquote_external, $external_quotes);
 $multiquote_deselect = $lang->multiquote_external_deselect;
 $multiquote_quote = $lang->multiquote_external_quote;
 }
 eval("\$multiquote_external = \"".$templates->get("newthread_multiquote_external")."\";");
 }
 }
 }
 }

 if(isset($mybb->input['quoted_ids']))
 {
 $quoted_ids = htmlspecialchars_uni($mybb->get_input('quoted_ids'));
 }

 $postoptionschecked = array('signature' => '', 'disablesmilies' => '');
 $postoptions_subscriptionmethod_dont = $postoptions_subscriptionmethod_none = $postoptions_subscriptionmethod_email = $postoptions_subscriptionmethod_pm = '';
 $postpollchecked = '';

 // Check the various post options if we're
 // a -> previewing a post
 // b -> removing an attachment
 // c -> adding a new attachment
 // d -> have errors from posting

 if(!empty($mybb->input['previewpost']) || $mybb->get_input('attachmentaid', 1) || $mybb->get_input('newattachment') || $mybb->get_input('updateattachment') || $thread_errors)
 {
 $postoptions = $mybb->get_input('postoptions', 2);
 if(isset($postoptions['signature']) && $postoptions['signature'] == 1)
 {
 $postoptionschecked['signature'] = " checked=\"checked\"";
 }
 if(isset($postoptions['subscriptionmethod']) && $postoptions['subscriptionmethod'] == "none")
 {
 $postoptions_subscriptionmethod_none = "checked=\"checked\"";
 }
 else if(isset($postoptions['subscriptionmethod']) && $postoptions['subscriptionmethod'] == "email")
 {
 $postoptions_subscriptionmethod_email = "checked=\"checked\"";
 }
 else if(isset($postoptions['subscriptionmethod']) && $postoptions['subscriptionmethod'] == "pm")
 {
 $postoptions_subscriptionmethod_pm = "checked=\"checked\"";
 }
 else
 {
 $postoptions_subscriptionmethod_dont = "checked=\"checked\"";
 }
 if(isset($postoptions['disablesmilies']) && $postoptions['disablesmilies'] == 1)
 {
 $postoptionschecked['disablesmilies'] = " checked=\"checked\"";
 }
 if($mybb->get_input('postpoll', 1) == 1)
 {
 $postpollchecked = "checked=\"checked\"";
 }
 $numpolloptions = $mybb->get_input('numpolloptions', 1);
 }

 // Editing a draft thread
 else if($mybb->input['action'] == "editdraft" && $mybb->user['uid'])
 {
 $mybb->input['threadprefix'] = $thread['prefix'];
 $message = htmlspecialchars_uni($post['message']);
 $subject = htmlspecialchars_uni($post['subject']);
 if($post['includesig'] != 0)
 {
 $postoptionschecked['signature'] = " checked=\"checked\"";
 }
 if($post['smilieoff'] == 1)
 {
 $postoptionschecked['disablesmilies'] = " checked=\"checked\"";
 }
 $icon = $post['icon'];
 if($forum['allowpicons'] != 0)
 {
 $posticons = get_post_icons();
 }
 if($postoptions['subscriptionmethod'] == "none")
 {
 $postoptions_subscriptionmethod_none = "checked=\"checked\"";
 }
 else if($postoptions['subscriptionmethod'] == "email")
 {
 $postoptions_subscriptionmethod_email = "checked=\"checked\"";
 }
 else if($postoptions['subscriptionmethod'] == "pm")
 {
 $postoptions_subscriptionmethod_pm = "checked=\"checked\"";
 }
 else
 {
 $postoptions_subscriptionmethod_dont = "checked=\"checked\"";
 }
 }

 // Otherwise, this is our initial visit to this page.
 else
 {
 if($mybb->user['signature'] != '')
 {
 $postoptionschecked['signature'] = " checked=\"checked\"";
 }
 if($mybb->user['subscriptionmethod'] ==  1)
 {
 $postoptions_subscriptionmethod_none = "checked=\"checked\"";
 }
 else if($mybb->user['subscriptionmethod'] == 2)
 {
 $postoptions_subscriptionmethod_email = "checked=\"checked\"";
 }
 else if($mybb->user['subscriptionmethod'] == 3)
 {
 $postoptions_subscriptionmethod_pm = "checked=\"checked\"";
 }
 else
 {
 $postoptions_subscriptionmethod_dont = "checked=\"checked\"";
 }
 $numpolloptions = "2";
 }

 $preview = '';

 // If we're preving a post then generate the preview.
 if(!empty($mybb->input['previewpost']))
 {
 // If this isn't a logged in user, then we need to do some special validation.
 if($mybb->user['uid'] == 0)
 {
 // Check if username exists.
 if(username_exists($mybb->get_input('username')))
 {
 // If it does throw back "username is taken"
 error($lang->error_usernametaken);
 }
 // This username does not exist.
 else
 {
 // If they didn't specify a username then give them "Guest"
 if(!$mybb->get_input('username'))
 {
 $username = $lang->guest;
 }
 // Otherwise use the name they specified.
 else
 {
 $username = htmlspecialchars_uni($mybb->get_input('username'));
 }
 $uid = 0;
 }
 }
 // This user is logged in.
 else
 {
 $username = $mybb->user['username'];
 $uid = $mybb->user['uid'];
 }

 // Set up posthandler.
 require_once MYBB_ROOT."inc/datahandlers/post.php";
 $posthandler = new PostDataHandler("insert");
 $posthandler->action = "thread";

 // Set the thread data that came from the input to the $thread array.
 $new_thread = array(
 "fid" => $forum['fid'],
 "prefix" => $mybb->get_input('threadprefix', 1),
 "subject" => $mybb->get_input('subject'),
 "icon" => $mybb->get_input('icon'),
 "uid" => $uid,
 "username" => $username,
 "message" => $mybb->get_input('message'),
 "ipaddress" => $session->packedip,
 "posthash" => $mybb->get_input('posthash')
 );

 if($pid != '')
 {
 $new_thread['pid'] = $pid;
 }

 $posthandler->set_data($new_thread);

 // Now let the post handler do all the hard work.
 $valid_thread = $posthandler->verify_message();
 $valid_subject = $posthandler->verify_subject();

 // guest post --> verify author
 if($new_thread['uid'] == 0)
 {
 $valid_username = $posthandler->verify_author();
 }
 else
 {
 $valid_username = true;
 }
 
 $post_errors = array();
 // Fetch friendly error messages if this is an invalid post
 if(!$valid_thread || !$valid_subject || !$valid_username)
 {
 $post_errors = $posthandler->get_friendly_errors();
 }

 // One or more errors returned, fetch error list and throw to newreply page
 if(count($post_errors) > 0)
 {
 $thread_errors = inline_error($post_errors);
 }
 else
 {
 if(empty($mybb->input['username']))
 {
 $mybb->input['username'] = $lang->guest;
 }
 $query = $db->query("
 SELECT u.*, f.*
 FROM ".TABLE_PREFIX."users u
 LEFT JOIN ".TABLE_PREFIX."userfields f ON (f.ufid=u.uid)
 WHERE u.uid='".$mybb->user['uid']."'
 ");
 $post = $db->fetch_array($query);
 if(!$mybb->user['uid'] || !$post['username'])
 {
 $post['username'] = htmlspecialchars_uni($mybb->get_input('username'));
 }
 else
 {
 $post['userusername'] = $mybb->user['username'];
 $post['username'] = $mybb->user['username'];
 }
 $previewmessage = $mybb->get_input('message');
 $post['message'] = $previewmessage;
 $post['subject'] = $mybb->get_input('subject');
 $post['icon'] = $mybb->get_input('icon', 1);
 $mybb->input['postoptions'] = $mybb->get_input('postoptions', 2);
 if(isset($mybb->input['postoptions']['disablesmilies']))
 {
 $post['smilieoff'] = $mybb->input['postoptions']['disablesmilies'];
 }
 $post['dateline'] = TIME_NOW;
 if(isset($mybb->input['postoptions']['signature']))
 {
 $post['includesig'] = $mybb->input['postoptions']['signature'];
 }
 if(!isset($post['includesig']) || $post['includesig'] != 1)
 {
 $post['includesig'] = 0;
 }

 // Fetch attachments assigned to this post
 if($mybb->get_input('pid', 1))
 {
 $attachwhere = "pid='".$mybb->get_input('pid', 1)."'";
 }
 else
 {
 $attachwhere = "posthash='".$db->escape_string($mybb->get_input('posthash'))."'";
 }

 $query = $db->simple_select("attachments", "*", $attachwhere);
 while($attachment = $db->fetch_array($query))
 {
 $attachcache[0][$attachment['aid']] = $attachment;
 }

 $postbit = build_postbit($post, 1);
 eval("\$preview = \"".$templates->get("previewpost")."\";");
 }
 $message = htmlspecialchars_uni($mybb->get_input('message'));
 $subject = htmlspecialchars_uni($mybb->get_input('subject'));
 }

 // Removing an attachment or adding a new one, or showing thread errors.
 else if($mybb->get_input('attachmentaid', 1) || $mybb->get_input('newattachment') || $mybb->get_input('updateattachment') || $thread_errors)
 {
 $message = htmlspecialchars_uni($mybb->get_input('message'));
 $subject = htmlspecialchars_uni($mybb->get_input('subject'));
 }

 // Generate thread prefix selector
 if(!$mybb->get_input('threadprefix', 1))
 {
 $mybb->input['threadprefix'] = 0;
 }

 $prefixselect = build_prefix_select($forum['fid'], $mybb->get_input('threadprefix', 1));

 $posthash = htmlspecialchars_uni($mybb->get_input('posthash'));

 // Can we disable smilies or are they disabled already?
 $disablesmilies = '';
 if($forum['allowsmilies'] != 0)
 {
 eval("\$disablesmilies = \"".$templates->get("newthread_disablesmilies")."\";");
 }
 else
 {
 eval("\$disablesmilies = \"".$templates->get("newthread_disablesmilies_hidden")."\";");
 }

 $modoptions = '';
 // Show the moderator options
 if(is_moderator($fid))
 {
 $modoptions = $mybb->get_input('modoptions', 2);
 if(isset($modoptions['closethread']) && $modoptions['closethread'] == 1)
 {
 $closecheck = "checked=\"checked\"";
 }
 else
 {
 $closecheck = '';
 }
 if(isset($modoptions['stickthread']) && $modoptions['stickthread'] == 1)
 {
 $stickycheck = "checked=\"checked\"";
 }
 else
 {
 $stickycheck = '';
 }
 eval("\$modoptions = \"".$templates->get("newreply_modoptions")."\";");
 $bgcolor = "trow1";
 $bgcolor2 = "trow2";
 }
 else
 {
 $bgcolor = "trow2";
 $bgcolor2 = "trow1";
 }

 // Fetch subscription select box
 eval("\$subscriptionmethod = \"".$templates->get("post_subscription_method")."\";");

 if($mybb->settings['enableattachments'] != 0 && $forumpermissions['canpostattachments'] != 0)
 { // Get a listing of the current attachments, if there are any
 $attachcount = 0;
 if($mybb->input['action'] == "editdraft" || ($mybb->input['tid'] && $mybb->input['pid']))
 {
 $attachwhere = "pid='$pid'";
 }
 else
 {
 $attachwhere = "posthash='".$db->escape_string($posthash)."'";
 }
 $query = $db->simple_select("attachments", "*", $attachwhere);
 $attachments = '';
 while($attachment = $db->fetch_array($query))
 {
 $attachment['size'] = get_friendly_size($attachment['filesize']);
 $attachment['icon'] = get_attachment_icon(get_extension($attachment['filename']));
 $attachment['filename'] = htmlspecialchars_uni($attachment['filename']);

 if($mybb->settings['bbcodeinserter'] != 0 && $forum['allowmycode'] != 0 && (!$mybb->user['uid'] || $mybb->user['showcodebuttons'] != 0))
 {
 eval("\$postinsert = \"".$templates->get("post_attachments_attachment_postinsert")."\";");
 }

 eval("\$attach_rem_options = \"".$templates->get("post_attachments_attachment_remove")."\";");

 $attach_mod_options = '';
 if($attachment['visible'] != 1)
 {
 eval("\$attachments .= \"".$templates->get("post_attachments_attachment_unapproved")."\";");
 }
 else
 {
 eval("\$attachments .= \"".$templates->get("post_attachments_attachment")."\";");
 }
 $attachcount++;
 }
 $query = $db->simple_select("attachments", "SUM(filesize) AS ausage", "uid='".$mybb->user['uid']."'");
 $usage = $db->fetch_array($query);
 if($usage['ausage'] > ($mybb->usergroup['attachquota']*1024) && $mybb->usergroup['attachquota'] != 0)
 {
 $noshowattach = 1;
 }
 if($mybb->usergroup['attachquota'] == 0)
 {
 $friendlyquota = $lang->unlimited;
 }
 else
 {
 $friendlyquota = get_friendly_size($mybb->usergroup['attachquota']*1024);
 }
 $friendlyusage = get_friendly_size($usage['ausage']);
 $lang->attach_quota = $lang->sprintf($lang->attach_quota, $friendlyusage, $friendlyquota);
 if($mybb->settings['maxattachments'] == 0 || ($mybb->settings['maxattachments'] != 0 && $attachcount < $mybb->settings['maxattachments']) && !isset($noshowattach))
 {
 eval("\$attach_add_options = \"".$templates->get("post_attachments_add")."\";");
 }

 if(($mybb->usergroup['caneditattachments'] || $forumpermissions['caneditattachments']) && $attachcount > 0)
 {
 eval("\$attach_update_options = \"".$templates->get("post_attachments_update")."\";");
 }

 if($attach_add_options || $attach_update_options)
 {
 eval("\$newattach = \"".$templates->get("post_attachments_new")."\";");
 }
 eval("\$attachbox = \"".$templates->get("post_attachments")."\";");

 $bgcolor = alt_trow();
 }

 if($mybb->user['uid'])
 {
 eval("\$savedraftbutton = \"".$templates->get("post_savedraftbutton", 1, 0)."\";");
 }

 $captcha = '';

 // Show captcha image for guests if enabled
 if($mybb->settings['captchaimage'] && !$mybb->user['uid'])
 {
 $correct = false;
 require_once MYBB_ROOT.'inc/class_captcha.php';
 $post_captcha = new captcha(false, "post_captcha");

 if((!empty($mybb->input['previewpost']) || $hide_captcha == true) && $post_captcha->type == 1)
 {
 // If previewing a post - check their current captcha input - if correct, hide the captcha input area
 // ... but only if it's a default one, reCAPTCHA and Are You a Human must be filled in every time due to draconian limits
 if($post_captcha->validate_captcha() == true)
 {
 $correct = true;

 // Generate a hidden list of items for our captcha
 $captcha = $post_captcha->build_hidden_captcha();
 }
 }

 if(!$correct)
 {
 if($post_captcha->type == 1)
 {
 $post_captcha->build_captcha();
 }
 elseif($post_captcha->type == 2)
 {
 $post_captcha->build_recaptcha();
 }
 elseif($post_captcha->type == 3)
 {
 $post_captcha->build_ayah();
 }

 if($post_captcha->html)
 {
 $captcha = $post_captcha->html;
 }
 }
 else if($correct && $post_captcha->type == 2)
 {
 $post_captcha->build_recaptcha();

 if($post_captcha->html)
 {
 $captcha = $post_captcha->html;
 }
 }
 else if($correct && $post_captcha->type == 3)
 {
 $post_captcha->build_ayah();

 if($post_captcha->html)
 {
 $captcha = $post_captcha->html;
 }
 }
 }

 if($forumpermissions['canpostpolls'] != 0)
 {
 $lang->max_options = $lang->sprintf($lang->max_options, $mybb->settings['maxpolloptions']);
 eval("\$pollbox = \"".$templates->get("newthread_postpoll")."\";");
 }

 // Do we have any forum rules to show for this forum?
 $forumrules = '';
 if($forum['rulestype'] >= 2 && $forum['rules'])
 {
 if(!$forum['rulestitle'])
 {
 $forum['rulestitle'] = $lang->sprintf($lang->forum_rules, $forum['name']);
 }

 if(!$parser)
 {
 require_once MYBB_ROOT.'inc/class_parser.php';
 $parser = new postParser;
 }

 $rules_parser = array(
 "allow_html" => 1,
 "allow_mycode" => 1,
 "allow_smilies" => 1,
 "allow_imgcode" => 1
 );

 $forum['rules'] = $parser->parse_message($forum['rules'], $rules_parser);
 $foruminfo = $forum;

 if($forum['rulestype'] == 3)
 {
 eval("\$forumrules = \"".$templates->get("forumdisplay_rules")."\";");
 }
 else if($forum['rulestype'] == 2)
 {
 eval("\$forumrules = \"".$templates->get("forumdisplay_rules_link")."\";");
 }
 }

 $moderation_notice = '';
 if(!is_moderator($forum['fid'], "canapproveunapproveattachs"))
 {
 if($forumpermissions['modattachments'] == 1  && $forumpermissions['canpostattachments'] != 0)
 {
 $moderation_text = $lang->moderation_forum_attachments;
 eval('$moderation_notice = "'.$templates->get('global_moderation_notice').'";');
 }
 }

 if(!is_moderator($forum['fid'], "canapproveunapprovethreads"))
 {
 if($forumpermissions['modthreads'] == 1)
 {
 $moderation_text = $lang->moderation_forum_thread;
 eval('$moderation_notice = "'.$templates->get('global_moderation_notice').'";');
 }
 }

 if(!is_moderator($forum['fid'], "canapproveunapproveposts"))
 {
 if($mybb->user['moderateposts'] == 1)
 {
 $moderation_text = $lang->moderation_user_posts;
 eval('$moderation_notice = "'.$templates->get('global_moderation_notice').'";');
 }
 }

 $plugins->run_hooks("newthread_end");

 $forum['name'] = strip_tags($forum['name']);
 $lang->newthread_in = $lang->sprintf($lang->newthread_in, $forum['name']);

 eval("\$newthread = \"".$templates->get("newthread")."\";");
 output_page($newthread);
}

Hmmmm.. What if you change line 175, so:
$query = $db->simple_select("attachments", "aid", "filename='".$db->escape_string($_FILES['attachment']['name'])."' AND {$attachwhere}");
to:
$query = $db->simple_select("attachments", "aid", "filename='".$db->escape_string((string)$_FILES['attachment']['name'])."' AND {$attachwhere}");
?
That took care of the PHP errors on top of the page but I still get the following:

Please correct the following errors before continuing:

The file upload failed. Please choose a valid file and try again. Error details: PHP returned error code: Array. Please contact your forum administrator with this error.

(2014-09-09, 09:44 PM)Destroy666 Wrote: [ -> ]Hmmmm.. What if you change line 175, so:
$query = $db->simple_select("attachments", "aid", "filename='".$db->escape_string($_FILES['attachment']['name'])."' AND {$attachwhere}");
to:
$query = $db->simple_select("attachments", "aid", "filename='".$db->escape_string((string)$_FILES['attachment']['name'])."' AND {$attachwhere}");
?

Destroy666,

Thanks for the help. I solved the problem with the PHP return code. Just in case anyone was wondering, I had maximum attachments installed and modded it to accept MyBB 1.8 (well at least I thought). Even after deactivating it, the error showed. I had to uninstall in order to be able to post.

Thanks for the help!!