AJAX detector in PHP
<?php
/* decide what the content should be up here .... */
$content = get_content(); //generic function;
/* AJAX check */
if(!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') {
/* special ajax here */
die($content);
}
/* not ajax, do more.... */