PHP 获取客户端IP

<?php
function getIP(){
    $ip = '127.0.0.1';
    if(isset($_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");
        }
    }
    return $ip;
}
echo getIP();
 ?>

效果图：