获取访问者的IP地址在留言板,论文坛等用户互动系统经常被实用到...本文给出一段在PHP环境下获得访问者真实IP的程序..供大家参考:

if (!empty($_SERVER['HTTP_CLIENT_IP']))
$ip=$_SERVER['HTTP_CLIENT_IP'];
else if (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
$ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
else
$ip=$_SERVER['REMOTE_ADDR'];
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