function get_real_ip(){
    if(!empty($_SERVER['HTTP_CLIENT_IP'])){
      
        $ip = $_SERVER['HTTP_CLIENT_IP'];
    }elseif(!empty($_SERVER['HTTP_X_FORWARDED_FOR'])){
        
        $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
    }else{
        $ip = $_SERVER['REMOTE_ADDR'];    //和你服务器握手的ip
    }
    return $ip;
}

echo get_real_ip();