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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Sample 2_1</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript">
<!--
//Create a boolean variable to check for a valid Internet Explorer instance.
var xmlhttp = false;
//Check if we are using IE.
function creatXMLHttp(){
 try
 {
  //If the Javascript version is greater than 5.
  xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
  //alert ("You are using Microsoft Internet Explorer.");
 }
 catch (e)
 {
  //If not, then use the older active x object.
  try
  {
   //If we are using Internet Explorer.
   xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
   //alert ("You are using Microsoft Internet Explorer");
  }
  catch (E)
  {
   //Else we must be using a non-IE browser.
   xmlhttp = false;
  }
 }
 //If we are using a non-IE browser, create a javascript instance of the object.
 if (!xmlhttp && typeof XMLHttpRequest != 'undefined')
 {
  xmlhttp = new XMLHttpRequest();
  //alert ("You are not using Microsoft Internet Explorer");
 }
}
function makerequest(serverPage, objID)
{
 creatXMLHttp();
 var obj = document.getElementById(objID);
 xmlhttp.open("GET", serverPage);
 xmlhttp.onreadystatechange = function()
 {
  if (xmlhttp.readyState == 4 && xmlhttp.status == 200)
  {
   obj.innerHTML = xmlhttp.responseText;
  }
 } 
 xmlhttp.send(null);


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<?php
function extend_1($file_name)
{
$retval="";
$pt=strrpos($file_name, ".");
if ($pt) $retval=substr($file_name, $pt+1, strlen($file_name) - $pt);
return ($retval);
}
?>
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{
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 <form id="textarea_test" action="textarea.php" method="post">
<textarea cols="50" rows="5" name="aa" id="abc" >

<?php
$str = $_POST['aa'];
//var_dump($str);
//$str = "chenjinle le";
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