Removing the keys from result_array()

[eluser]Coode[/eluser]
This is something I didn't try out myself, but give it a shot!

Code:

<?php
   $r = blah blah->result_array();
   $ids = array_map('intval', array_map('end', $r));
?>

The variable would be array(1, 2, 3, 4).