PHP获取客户端IP地址，服务器IP地址

============================================获取客户端IP==============================================
public static function getClientIp() {
    if (getenv('HTTP_CLIENT_IP')) {
        $client_ip = getenv('HTTP_CLIENT_IP');
    } elseif (getenv('HTTP_X_FORWARDED_FOR')) {
        $client_ip = getenv('HTTP_X_FORWARDED_FOR');
    } elseif (getenv('REMOTE_ADDR')) {
        $client_ip = getenv('REMOTE_ADDR');
    } else {
        $client_ip = $_SERVER['REMOTE_ADDR'];
    }
    return $client_ip;
}

============================================获取服务端IP==============================================

public static function getServerIp() {

    if (isset($_SERVER)) {
        if ($_SERVER['SERVER_ADDR']) {
            $server_ip = $_SERVER['SERVER_ADDR'];
        } else {
            $server_ip = $_SERVER['LOCAL_ADDR'];
        }
    } else {
        $server_ip = getenv('SERVER_ADDR');
    }
    return $server_ip;
}