title: PDO fetchAll PDO::FETCH_COLUMN equivalent to PDO::FETCH_NUM?
body: <p>Is this code</p>
  
  <pre><code>/* already set up a query with one column in result */
  
  $row['fk_user_pks'] = $q-&gt;fetchAll(PDO::FETCH_COLUMN);
  </code></pre>
  
  <p>equivalent to:</p>
  
  <pre><code>/* already set up a query with one column in result row */
  
  $result = $q-&gt;fetchAll(PDO::FETCH_NUM);
  $row['fk_user_pks'] = array();
  foreach ($result as $r) {
       $row['fk_user_pks'][] = $r[0];
  }
  </code></pre>