php获取请求客户端的真实ip
解决方法：
$ip='';
if (isset($_SERVER)){
if (isset($_SERVER["HTTP_X_FORWARDED_FOR"])){
$ip= $_SERVER["HTTP_X_FORWARDED_FOR"];
} else if (isset($_SERVER["HTTP_CLIENT_IP"])) {
$ip= $_SERVER["HTTP_CLIENT_IP"];
} else {
$ip= $_SERVER["REMOTE_ADDR"];
}
} else {
if (getenv("HTTP_X_FORWARDED_FOR")){
$ip= getenv("HTTP_X_FORWARDED_FOR");
} else if (getenv("HTTP_CLIENT_IP")) {
$ip= getenv("HTTP_CLIENT_IP");
} else {
$ip= getenv("REMOTE_ADDR");
}
}