How to detect Ajax Request in PHP

Today, we will know how to detect the ajax request in PHP. if you want to know if that is an ajax request or not. so you can below example by you can easily know is that ajax request or not.

we will use the HTTP_X_REQUESTED_WITH to check if the incoming request is AJAX.

<?php 
if(isset($_SERVER['HTTP_X_REQUESTED_WITH']) && !empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest')
{
	echo "This is Ajax Request";
	exit;
} 
?>

<?php

if(isset($_SERVER['HTTP_X_REQUESTED_WITH']) && !empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest')

{

echo "This is Ajax Request";

exit;

}

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