Online PHP editor | refs for dGgpp

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