- var_dump: documentation ( source)
- asort: documentation ( source)
<?php
$foo[1]['items'][] = 'Third';
$foo[0]['items'][] = 'Second';
$foo[4]['items'][] = 'Last';
$foo[-1]['items'][] = 'I will be first';
$foo[0]['items'][] = 'Also second';
asort($foo);
echo '<pre>';
var_dump($foo);
echo '</pre>';