问题：

为此，我使用下面的代码shippet获取用户的IP地址：

if (isset($_SERVER['HTTP_CLIENT_IP'])){


 $ip = $_SERVER['HTTP_CLIENT_IP'];


}else if(isset($_SERVER['HTTP_X_FORWARDED_FOR'])){


 $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];


}else if(isset($_SERVER['HTTP_X_FORWARDED'])){


 $ip = $_SERVER['HTTP_X_FORWARDED'];


}else if(isset($_SERVER['HTTP_FORWARDED_FOR'])){


 $ip = $_SERVER['HTTP_FORWARDED_FOR'];


}else if(isset($_SERVER['HTTP_FORWARDED'])){


 $ip = $_SERVER['HTTP_FORWARDED'];


}else if(isset($_SERVER['REMOTE_ADDR'])){


 $ip = $_SERVER['REMOTE_ADDR'];


}else{


 echo "ERROR";


}

这一切都很好，但有时我得到一个IPv4地址，我还可以使用ping -6 server_ip ping服务器，

答案1：

没有什么错误，它可以通过IPv4连接。