Core PHP中的Ajax调用，

in one of my front end PHP files im doing this in my Jquery :

var name = $('#core_name').val();
var param = {};
        param['name'] = name;
        $.ajax({
            url:'../back_end/user.php/verify_name',
            data:param,
            type:'POST',
            success:function(result){
                alert(result);
            }
        });

In my back_end/user.php im doing this :

<?php
class User{

    function index(){
        //for now do nothing  
    }
    function verify_name(){
        echo "here";        
    }
}
?>

Why cant i alert "here", what is it that iam doing wrong ? Firebug detects no error , so the file user.php has correct path (no 404 error) why cant i reach the function verify_name ?

You need to instantiate the User class and call verify_name() on back_end/user.php.

You can do this adding the following to back_end/user.php:

$user = new User;
$user->verify_name();