php获取客户端IP地址的几种方法

$iipp=$_SERVER['REMOTE_ADDR'];echo $iipp;?>

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$user_IP = ($_SERVER['HTTP_VIA']) ? $_SERVER['HTTP_X_FORWARDED_FOR'] : $_SERVER['REMOTE_ADDR'];$user_IP = ($user_IP) ? $user_IP : $_SERVER['REMOTE_ADDR'];

echo $user_IP;?>

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function get_real_ip(){$ip=false;if(!empty($_SERVER['HTTP_CLIENT_IP'])){$ip = $_SERVER['HTTP_CLIENT_IP'];}if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {$ips = explode (', ', $_SERVER['HTTP_X_FORWARDED_FOR']);if ($ip) { array_unshift($ips, $ip); $ip = FALSE; }for ($i = 0; $i < count($ips); $i++) {if (!eregi ('^(10|172.16|192.168).', $ips[$i])) {$ip = $ips[$i];break;}}}return ($ip ? $ip : $_SERVER['REMOTE_ADDR']);}

echo get_real_ip();?>

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//php获取ip的算法if ($HTTP_SERVER_VARS['HTTP_X_FORWARDED_FOR']) { $ip = $HTTP_SERVER_VARS['HTTP_X_FORWARDED_FOR']; } elseif ($HTTP_SERVER_VARS['HTTP_CLIENT_IP']) { $ip = $HTTP_SERVER_VARS['HTTP_CLIENT_IP']; }elseif ($HTTP_SERVER_VARS['REMOTE_ADDR']) { $ip = $HTTP_SERVER_VARS['REMOTE_ADDR']; } elseif (getenv('HTTP_X_FORWARDED_FOR')) { $ip = getenv('HTTP_X_FORWARDED_FOR'); } elseif (getenv('HTTP_CLIENT_IP')) { $ip = getenv('HTTP_CLIENT_IP'); } elseif (getenv('REMOTE_ADDR')){ $ip = getenv('REMOTE_ADDR'); } else { $ip = 'Unknown'; } echo '你的IP:'.$ip ; ?>

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if(getenv('HTTP_CLIENT_IP')) { $onlineip = getenv('HTTP_CLIENT_IP');} elseif(getenv('HTTP_X_FORWARDED_FOR')) { $onlineip = getenv('HTTP_X_FORWARDED_FOR');} elseif(getenv('REMOTE_ADDR')) { $onlineip = getenv('REMOTE_ADDR');} else { $onlineip = $HTTP_SERVER_VARS['REMOTE_ADDR'];}echo $onlineip;?>