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
 * @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';

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