Multidimensional Arrays Nested to Unlimited Depth

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I’m eventually looking for all nested arrays called “xyz”. Has anyone got any suggestions?

Sure. Building on the suggestions to use some iterators, you can do:

$iterator = new RecursiveIteratorIterator(
    new RecursiveArrayIterator($array),
    RecursiveIteratorIterator::SELF_FIRST
);
foreach ($iterator as $key => $item) {
    if (is_array($item) && $key === 'xyz') {
        echo "Found xyz: ";
        var_dump($item);
    }
}

The important difference between the other answers and this being that the RecursiveIteratorIterator::SELF_FIRST flag is being employed to make the non-leaf (i.e. parent) items (i.e. arrays) visible when iterating.

You could also make use of a ParentIterator around the array iterator, rather than checking for arrays within the loop, to make the latter a little tidier.

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