PHP check whether Incoming Request is JSON type

Question

Is there anyway to check whether an incoming request is of AJAX JSON type?

I tried

if(($_SERVER[\'REQUEST_METHOD\']==\'JSON\'))
{
}

Answer 1

You can check the X-Requested-With header, some libraries, like jQuery set it to "XMLHttpRequest".

$isAjaxRequest = $_SERVER['X_REQUESTED_WITH'] == 'XMLHttpRequest';