title: Will PDO laststatment->fetchAll(PDO::FETCH_COLUMN, $column) rerun the query each call?
body: <p>I am doing a query which fetches two fields.<br>
  I need each of those fields into a different array.<br>
  Will this rerun the query for each call or just re iterate over the result set?</p>
  
  <pre><code>$a= Laststatment-&gt;fetchAll(PDO::FETCH_COLUMN,0);
  $b= Laststatment-&gt;fetchAll(PDO::FETCH_COLUMN,1);
  </code></pre>