jQuery Validate remote method usage to check if username already exists

I want to validate if username exists in database using jQuery.validate so here’s what I have so far:

jQuery:

    $("#signupForm").validate({
        rules: {
            username: {
                required: true,
                minlength: 3,
                remote: "check-username.php"
                }
            },
        messages: {
            username:{
                remote: "This username is already taken! Try another."
            }
        }
  });

check-username.php:

<?php

require_once "./source/includes/data.php";
header('Content-type: application/json');

$name = mysql_real_escape_string($_POST['username']);

$check_for_username = mysql_query("SELECT username FROM mmh_user_info WHERE username='$name'");

if (mysql_num_rows($check_for_username) > 0) {
    $output = true;
} else {
    $output = false;
}
echo json_encode($output);
?>

This code always shows an error that the username is taken even if it’s not.

I’m using jQuery Mobile 1.9.1

Thanks in advance.

Answer

I’ve managed to get this to work by changing the PHP technique I was using, here’s my PHP:

<?php
require_once "./source/includes/data.php";
header('Content-type: application/json');
$request = $_REQUEST['username'];

$query = mysql_query("SELECT * FROM mmh_user_info WHERE username ='$username'");
$result = mysql_num_rows($query);
if ($result == 0){
$valid = 'true';}
else{
$valid = 'false';
}
echo $valid;
?>

Thanks everyone here for your help 🙂