bootstrapvalidator/demo/remote2.php

<?php
// This is a sample PHP script which demonstrates the 'remote' validator
// To make it work, point the web server to root Bootstrap Validate directory
// and open the remote.html file:
// http://domain.com/demo/remote.html

//sleep(5);

$valid   = true;
$message = '';

$users = array(
    'admin'         => 'admin@domain.com',
    'administrator' => 'administrator@domain.com',
    'root'          => 'root@domain.com',
);

if (isset($_POST['username']) && array_key_exists($_POST['username'], $users)) {
    $valid   = false;
    $message = 'The username is not available';
} else if (isset($_POST['email'])) {
    $email = $_POST['email'];
    foreach ($users as $k => $v) {
        if ($email == $v) {
            $valid   = false;
            $message = 'The email is not available';
            break;
        }
    }
}

echo json_encode(
    $valid ? array('valid' => $valid) : array('valid' => $valid, 'message' => $message)
);