php程序获得访问者ip的代码_[PHP教程]

if (isset($_SERVER["HTTP_X_FORWARDED_FOR"]))
{
$realip = $_SERVER["HTTP_X_FORWARDED_FOR"];
}
elseif (isset($_SERVER["HTTP_CLIENT_IP"]))
{
$realip = $_SERVER["HTTP_CLIENT_IP"];
}
else
{
$realip = $_SERVER["REMOTE_ADDR"];
}