两段 PHP 代码比较优劣

// 代码一 

public function getPCA($level = false)
    {
        $results = array();
        $where = $level ? " where f_level={$level}" : '';
        $sql = "select * from {$this->_table}{$where}";
        $query = $this->dbLink->query($sql);
        if (! $this->dbLink->errno()) {
            if ($this->dbLink->num_rows($query)) {
                $row = $this->dbLink->fetch_assoc($query);
                while ($row) {
                    $results[$row['id']] = $row['f_name'];
                    $row = $this->dbLink->fetch_assoc($query);
                }
            }
        }

        return $results;
    }

　　

代码二：

   public function getPCA($level = false , $debug =  false)
    {
        $results = array();
        $where = $level ? " where f_level={$level}" : '';
        $sql = "select * from {$this->_table}{$where}";

        $query = $this->dbLink->query($sql);

		if($debug)
		{
			echo $sql;
			echo $this->dbLink->errno();
		}
        if (! $this->dbLink->errno()) {
            if ($this->dbLink->num_rows($query))
			{
                while ($row = $this->dbLink->fetch_assoc($query))
				{
                    $results[$row['id']] = $row['f_name'];
                }
            }
        }
        return $results;
    }