This simple script checks for the X-Requested-With header that most common JavaScript frameworks and libraries will set to XMLHttpRequest if sending a request via AJAX.

The function can be useful in determining what sort of response to send back to the client. For example a JSON response or a full HTML response.

/**
 * Is the Request an AJAX Request?
 *
 * This works if your JavaScript library sets the X-Requested-With HTTP header. Most common JavaScript frameworks do:
 *
 * @see http://en.wikipedia.org/wiki/List_of_Ajax_frameworks#JavaScript
 *
 * @return bool Returns true if the request is an AJAX request, false otherwise
 */
function isAjax()
{
	return isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest';
}

This code snippet was published on Jul 12, 2019, at 00:00:00 (UTC). It was last edited on Jul 17, 2024, at 00:17:26 (UTC).