- print_r: documentation ( source)
- array_walk_recursive: documentation ( source)
<?php
$arr = array();
$arr[] = array(1 => array(2 => 2, 3 => array(4 => 4, 5 => 5)), 6 => 6);
function showArray(&$arr) {
echo('<pre>'.print_r($arr,true).'</pre>');
}
array_walk_recursive($arr, 'showArrow');