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CAn u please help me?
Lets say i have a file were i have written the number one($number = '1'
And i load the page where $number is printed then i change the file where the variable is to the number two and in the page where i print it press update the span would update to its new value

Here you go. This assumes you already have the form that brings the vairables value:

 if (isset($_POST['submit'])) {

 // update the file
 $str = "<?php
  foreach ($_POST as $k=>$v)
 {
 if ($k != 'submit')              // ignore submit button
 {
 $str .= "\$$k='$v';\n";        // add line to file
  }
  }
 $str .= "?>";
 $file_open = fopen('path_to_file', "w+");
 fwrite($file_open, $str);
 $fclose($file_open);
 }
?>

This is not what i need
I need it to update a span without refresh
As in some sites have external torrents and have an ajax feature that when pressed updates external seeders and leecher without refresh

The above will update a php variable without AJAX. Search ajaxrain.com to find some AJAX code. Do note that AJAX will not update the variable as you would need php to do it.

Not to update variable in file but the printed one
Pay more attention

Edit:
example:

print("<a href=# onlick=update_number>Update</a><span id=to_be_update>$number</span>");

Trying to explain that i load the page with number one and the i edit file with the variable then i go to the page(wich i dont close nor refresh) and press Update and then the number updates and shows 2

IIRC the javascript you need is:

document.getElementByID('id_goes_here').innerHTML = "HTML goes here!";

That should replace the content of a particular ID with the HTML that you put in the Javascript.

There is a few tutorials here:
http://www.tizag.com/javascriptT/javascr...erHTML.php

To get the AJAX I would recommend something like Mochikit (what I am learning to use) or MooTools.

i have the script but dont know how to use it

var http_request=false;

function UpdateExternalTorrent(url,parameters,tid)
{
torrentid=tid
oldDiv3=TSGetID('isexternal_'+torrentid);
newDiv3=document.createElement(oldDiv3.tagName);
newDiv3.id=oldDiv3.id;newDiv3.className=oldDiv3.className;
newDiv3.innerHTML='<img src="'+dimagedir+'/ajax-loader.gif" class="inlineimg" border="0" alt="'+l_pleasewait+'" title="'+l_pleasewait+'">&nbsp;'+l_pleasewait;
oldDiv3.parentNode.replaceChild(newDiv3,oldDiv3);
http_request=false;if(window.XMLHttpRequest)
{
http_request=new XMLHttpRequest();
if(http_request.overrideMimeType)
{
http_request.overrideMimeType('text/html');
}
}
else if(window.ActiveXObject)
{
try {http_request=new ActiveXObject("Msxml2.XMLHTTP"); }

catch(e)
{
try{http_request=new ActiveXObject("Microsoft.XMLHTTP");}catch(e){}}}
if(!http_request){show_error_message(l_ajaxerror2);return false;}
http_request.onreadystatechange=tsUpdate;
http_request.open('POST',url,true);
http_request.setRequestHeader("Content-type","application/x-www-form-urlencoded");
http_request.setRequestHeader("Content-length",parameters.length);
http_request.setRequestHeader("Connection","close");
http_request.send(parameters);
}
function tsUpdate()
{
if(http_request.readyState==4)
{
if(http_request.status==200)
{
var result=http_request.responseText;changeText(result);}else{show_error_message(l_ajaxerror);
}
}
}
function changeText(ajaxResult)
{
if(ajaxResult.match(/<error>(.*)<\/error>/))
{
message=ajaxResult.match(/<error>(.*)<\/error>/);if(!message[1])
{
message[1]=l_ajaxerror;}
show_error_message(l_updateerror+message[1]);
}
else
{
update=ajaxResult.split('|');
oldDiv1=TSGetID('seeders_'+update[2]);
newDiv1=document.createElement(oldDiv1.tagName);
newDiv1.id=oldDiv1.id;
newDiv1.className=oldDiv1.className;
newDiv1.innerHTML=update[0];
oldDiv1.parentNode.replaceChild(newDiv1,oldDiv1);
oldDiv2=TSGetID('leechers_'+update[2]);
newDiv2=document.createElement(oldDiv2.tagName);
newDiv2.id=oldDiv2.id;
newDiv2.className=oldDiv2.className;
newDiv2.innerHTML=update[1];
oldDiv2.parentNode.replaceChild(newDiv2,oldDiv2);
oldDiv3=TSGetID('isexternal_'+update[2]);
newDiv3=document.createElement(oldDiv3.tagName);
newDiv3.id=oldDiv3.id;newDiv3.className=oldDiv3.className;
newDiv3.innerHTML='<img src="'+dimagedir+'input_true.gif">'
oldDiv3.parentNode.replaceChild(newDiv3,oldDiv3);
}
}

function show_error_message(message)
{
oldDiv4=TSGetID('isexternal_'+torrentid);
newDiv4=document.createElement(oldDiv4.tagName);
newDiv4.id=oldDiv4.id;newDiv4.className=oldDiv4.className;newDiv4.innerHTML=''
oldDiv4.parentNode.replaceChild(newDiv4,oldDiv4);
alert(message)
}