[SOLVED] How can I choose only 2 columns without changing the SELECT query?

How can I choose only 2 columns without changing the SELECT query?

I am generating a table with this code:

if ($arch = $pdo->prepare("SELECT one, two, three, four FROM numbers)) { 
  $arch ->execute();
  $data = $arch->fetchAll();
  echo '<table>';
  foreach ($data as $row){
  echo '<tr>';
  foreach ($row as $col){
  $col=nl2br($col);
  echo '<td>'.$col.'</td>';
  }
  echo '</tr>';
  }
  echo '</table>'; 
  }  
}

This populates a table with 4 columns.

How can I choose only 2 columns without changing the SELECT query? In other words, how can I choose the columns I want to populate the table? for example I would like to use only "three" and "four"...

I read about fetchAll(PDO::FETCH_COLUMN, 0) but this seems to pick only one column. The same goes for fetchColumn(). I want to pick more than one so I can populate my table with only the columns I need.

Solution

Alternatively, you can specify the columns you want as an array beforehand, and iterate over that array rather than the columns in the row.

$columns = array('I_like_this_column', 'this_one_too');
foreach ($columns as $colName)
  echo '<td>' . nl2br($row[$colName]) . '</td>';

This has the added advantage of letting you specify the order the columns will appear in your output without changing your query.

And, as with @stUrb's answer, you need to turn on PDO::FETCH_ASSOC for this to work.