- array_splice: documentation ( source)
- print_r: documentation ( source)
<?php
$columns = array(
array('id' => 'ID'),
array('text' => 'Text'),
array('image' => 'Bild'),
);
array_splice($columns, 2, 0, array(array('edition' => 'Heft-Ausgabe')));
print_r($columns);