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