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/** * 获得用户的真实IP地址 * * @return string */function
getRealip(){ static
$realip = NULL; if
($realip !== NULL) { return
$realip; } if
(isset($_SERVER)) { if
(isset($_SERVER[‘HTTP_X_FORWARDED_FOR‘])) { $arr
= explode(‘,‘, $_SERVER[‘HTTP_X_FORWARDED_FOR‘]); /* 取X-Forwarded-For中第一个非unknown的有效IP字符串 */ foreach
($arr AS $ip) { $ip
= trim($ip); if
($ip != ‘unknown‘) { $realip
= $ip; break; } } } elseif
(isset($_SERVER[‘HTTP_CLIENT_IP‘])) { $realip
= $_SERVER[‘HTTP_CLIENT_IP‘]; } else { if
(isset($_SERVER[‘REMOTE_ADDR‘])) { $realip
= $_SERVER[‘REMOTE_ADDR‘]; } else { $realip
= ‘0.0.0.0‘; } } } else { if
(getenv(‘HTTP_X_FORWARDED_FOR‘)) { $realip
= getenv(‘HTTP_X_FORWARDED_FOR‘); } elseif
(getenv(‘HTTP_CLIENT_IP‘)) { $realip
= getenv(‘HTTP_CLIENT_IP‘); } else { $realip
= getenv(‘REMOTE_ADDR‘); } } return
$realip;} |
原文：http://www.cnblogs.com/WhiteCusp/p/3543907.html