测试代码样式

$catQuery = $db->select('name')->from($prefix . 'metas')
    ->join($prefix . 'relationships', $prefix . 'relationships.mid = ' . $prefix . 'metas.mid')
    ->where($prefix . 'relationships.cid = ?', $article['cid'])
    ->where('type = ?', 'category');
$categories = $db->fetchAll($catQuery);

$categories = $db->fetchAll($catQuery);