demo30.php

<?php
 
$errors         = array();      // array to hold validation errors
$data             = array();         // array to pass back data
 
// validate the variables ======================================================
    if (empty($_POST['name']))
        $errors['name'] = 'Name is required.';
 
    if (empty($_POST['superheroAlias']))
        $errors['superheroAlias'] = 'Superhero alias is required.';
 
// return a response ===========================================================
 
    // response if there are errors
    if ( ! empty($errors)) {
 
        // if there are items in our errors array, return those errors
        $data['success'] = false;
        $data['errors']  = $errors;
    } else {
 
        // if there are no errors, return a message
        $data['success'] = true;
        $data['message'] = 'Success!';
    }
 
    // return all our data to an AJAX call
    echo json_encode($data);

?>