//方法1：

$ip = $_SERVER["REMOTE_ADDR"];echo $ip;

//方法2：

复制代码 代码如下:
$user_IP = ($_SERVER["HTTP_VIA"]) ? $_SERVER["HTTP_X_FORWARDED_FOR"] : $_SERVER["REMOTE_ADDR"];
$user_IP = ($user_IP) ? $user_IP : $_SERVER["REMOTE_ADDR"];
echo $user_IP;

//方法3：

function getRealIp(){ $ip=false; if(!empty($_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 getRealIp();

//方法4：

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 $ip ;

//方法5：

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;

//方法6：

print "您的IP地址是：";if(!empty($_SERVER["HTTP_CLIENT_IP"])){ $cip = $_SERVER["HTTP_CLIENT_IP"];}elseif(!empty($_SERVER["HTTP_X_FORWARDED_FOR"])){ $cip = $_SERVER["HTTP_X_FORWARDED_FOR"];}elseif(!empty($_SERVER["REMOTE_ADDR"])){ $cip = $_SERVER["REMOTE_ADDR"];}else{ $cip = "无法获取！";}print $cip;

以上所述就是本文的全部内容了，希望对大家学习php能够有所帮助。