php - $_GET the value of (&) with AJAX -


i have 3 codes first 1 html:

<html> <head> <script type = "text/javascript" src = "ajax.js"></script> </head>  <body> <form method = "get" >     <input type = "text" id ="a" ><br>     <input type = "text" id = "b"><br>     <input type = "button" value ="click"  onclick = "process()"><br>     <textarea id = "underbutton" ></textarea><br> </form> <body> </html>

now javascript (ajax) :

function process() {     if(xmlhttp.readystate==0 || xmlhttp.readystate==4){          = document.getelementbyid("a").value;                 b = document.getelementbyid("b").value;         xmlhttp.onreadystatechange = handleserverresponse;         xmlhttp.open("get","file.php?a="+a+"&b="+b,true);         xmlhttp.send();     } }  function handleserverresponse (){     if(xmlhttp.readystate==4 && xmlhttp.status==200)         {          response = xmlhttp.responsetext;         document.getelementbyid("underbutton").innerhtml =  response ;           }  }

now php file :

<?php    echo $_get['a'].'<br>'; echo $_get['b'].'<br>';  ?>

everything working problem when type in first texbox (a) word hello , second (b) code & , click button ; must print out hello&.
prints hello!!
hello without &.

i noted sending php file : file.php?a=hello&b=&.
last & must %26

so print out & must send : file.php?a=hello&b=%26.

how can fix ??

change in javascript:

- = document.getelementbyid("a").value; - b = document.getelementbyid("b").value; + = encodeuricomponent(document.getelementbyid("a").value); + b = encodeuricomponent(document.getelementbyid("b").value);

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