Use ajax return value on php

[neilyak]

I am trying to pass ajax response value to a php function. ajax.js\[code\] xmlhttp.onreadystatechange=function(){ if (xmlhttp.readyState==4 && xmlhttp.status==200){ var a = xmlhttp.responseText; } }\[/code\]I need \[code\]a\[/code\] value to be used in PHP function.test.php\[code\]function testFun($a); \[/code\]Is this possible??? Thanks for the help!!