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How to check if a Request is an AJAX call with PHP

30th Jan 2015
Ajax

It is useful to prevent direct access of AJAX calls (from browser address bar).


function check_is_ajax($script) {
  $isAjax = isset($_SERVER['HTTP_X_REQUESTED_WITH']) AND
  strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) === 'xmlhttprequest';
  if(!$isAjax) {
    trigger_error('Access denied - not an AJAX request...' . ' (' . $script . ')', E_USER_ERROR);
  }
}