Handle CORS in PHP

cors.php

<?php

/* Handle CORS */

// Specify domains from which requests are allowed
header('Access-Control-Allow-Origin: *');

// Specify which request methods are allowed
header('Access-Control-Allow-Methods: PUT, GET, POST, DELETE, OPTIONS');

// Additional headers which may be sent along with the CORS request
header('Access-Control-Allow-Headers: X-Requested-With,Authorization,Content-Type');

// Set the age to 1 day to improve speed/caching.
header('Access-Control-Max-Age: 86400');

// Exit early so the page isn't fully loaded for options requests
if (strtolower($_SERVER['REQUEST_METHOD']) == 'options') {
    exit();
}