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Most of the JavaScript frameworks like jQuery, mootools send and additional HTTP_X_REQUESTED_WITH header when they make an AJAX request, so that you can detect AJAX request on server side.

 if(!empty($_SERVER['HTTP_X_REQUESTED_WITH'])
 && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest')
 {
   //If AJAX Request Then 
 } else { 
   //something else 
 }

For More Info http://davidwalsh.name/detect-ajax

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