<?php  /*****************************************************  *  *    isProxy  *    check whether client is under Proxy or not  *    $_SERVER['HTTP_X_FORWARDED_FOR'] is pivotal here  *    if client is under Proxy, returns true  *    if client is not under Proxy, returns false  *      *****************************************************/    function isProxy(){      return (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) ? true : false;  }  ?>