Online PHP editor | refs for 9Wsh8

<?php function map(array $array, array $keys) { $filter = function ($branch) { return $branch; }; foreach (array_reverse($keys) as $key) { $filter = function ($branch) use ($filter, $key) { switch ($key) { case '*': case '?': return array_map(function ($dimension) use ($filter) { return $filter($dimension); }, $branch); default: var_dump($key, $branch); return $filter($branch[$key]); } }; } return $filter($array); } $array = [ 'a' => [ 'b' => [ [ 'c' => 'foo', ], [ 'c' => 'bar', ], [ 'c' => 'qux', ], ], ], ]; $keys = ['a', 'b', '*', 'c']; var_dump(map($array, $keys));