PHP获取访问者公网IP

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 "您的IP地址是：".$cip;