判断访问IP

php代码

<?php   function getIP() {       if (! empty ( $_SERVER ["HTTP_CLIENT_IP"] )) {           $cip = $_SERVER ["HTTP_CLIENT_IP"];       } else if (! empty ( $_SERVER ["HTTP_X_FORWARDED_FOR"] )) {           $cip = $_SERVER ["HTTP_X_FORWARDED_FOR"];       } else if (! empty ( $_SERVER ["REMOTE_ADDR"] )) {           $cip = $_SERVER ["REMOTE_ADDR"];       } else {           $cip = '';       }       preg_match ( "/[\d\.]{7,15}/", $cip, $cips );       $cip = isset ( $cips [0] ) ? $cips [0] : 'unknown';       unset ( $cips );       return $cip;   }     ?>