简单的php获取IP地址的函数：

/**获取IP*/function GetIp(){    if (getenv('HTTP_CLIENT_IP')) {        $IP = getenv('HTTP_CLIENT_IP');    }    elseif (getenv('HTTP_X_FORWARDED_FOR')) {        $IP = getenv('HTTP_X_FORWARDED_FOR');    }    elseif (getenv('HTTP_X_FORWARDED')) {        $IP = getenv('HTTP_X_FORWARDED');    }    elseif (getenv('HTTP_FORWARDED_FOR')) {        $IP = getenv('HTTP_FORWARDED_FOR');    }    elseif (getenv('HTTP_FORWARDED')) {        $IP = getenv('HTTP_FORWARDED');    }    else {        $IP = $_SERVER['REMOTE_ADDR'];    }    if(isset($_GET['debug'])){      return $_GET['debug'];    }    return $IP;}