- array_map: documentation ( source)
- var_dump: documentation ( source)
- print_r: documentation ( source)
- ksort: documentation ( source)
<?php
$map = array(array('-1'=>0, '-10'=>0, '-100'=>0), array(array('-1'=>0, '-10'=>0, '-100'=>0)));
array_map(function($item){var_dump($item);if(is_array($item))ksort($item);}, $map);
print_r($map);