How to block direct access to php file called by ajax function

It must be noted however that this is just a basic security step and it does not guarantee that a malicious user can not find a way to access the php file. This means that you should always make sure that your php code is secure.


// No direct access to this file 
define('IS_AJAX', isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest'); 
if(!IS_AJAX) {die('Restricted access');}

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