How to Detect AJAX Request by PHP

The HTTP_X_REQUESTED_WITH header is sent by all recent browsers that support AJAX requests. if ( !empty($_SERVER['HTTP_X_REQUESTED_WITH&...

The HTTP_X_REQUESTED_WITH header is sent by all recent browsers that support AJAX requests.
if ( !empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest' )
{
# Ex. check the query and serve requested data
}

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