public function query_first($sql)
	{
		time_start('query_first ('.$sql.')');
		$result = mysqli_query(self::$mysqli[$this->server], trim($sql));
		if (!$result)
		{
			throw new E_mysql('error query_first', 11);
		}
		$this->result = $result;
		$array = mysqli_fetch_array($this->result, MYSQLI_NUM);
		$this->stmclose();
		time_end();

		return $array;
	}