php判断访问IP的方法

本文实例讲述了php判断访问IP的方法。分享给大家供大家参考。具体如下：

<?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; } ?>

希望本文所述对大家的php程序设计有所帮助。