PHP - Apply operations to descendant arrays regardless of parent arrays - php

Question

In a multidimensional array, I'm trying to select all descendant arrays with a certain key, no matter what their parent arrays are. I know the following syntax doesn't work, but hopefully it will help illustrate what I'm trying to accomplish:
<?php
foreach ($array[*][*]['descendant'] as $descendent) {
// do stuff
}
?>
Similarly, I need to figure out whether sibling arrays do not contain this array key. Something like this (again, I know the syntax is horribly wrong):
<?php
foreach ($array[*][*]['descendant'] < 1 as $descendent) {
// do stuff
}
?>

Answer 1

If there are always 3-dimensional array, you can use nested loop:
foreach($array as $lv1) {
foreach($lv1 as $lv2) {
foreach($lv2['descendant'] as $descendent) {
// do stuff
}
}
}
If you want to support unlimited number of dimension, you can use this ugly code
function drill($arr) {
if (isset($arr) && is_array($arr)) {
foreach($arr as $key => $value) {
if ($key == 'descendant') {
foreach($value as $descendent) {
// do stuff here
}
} else {
drill($value);
}
}
}
}
drill($array);