Online PHP editor | refs for bQ5sK

<?php $array = array( array("title" => 1, "children" => array( array( "selected" => true, "key" => 12345, "children" => array() ) ) ) ); $selectedValues = array(); $iterator = new \RecursiveIteratorIterator(new \RecursiveArrayIterator($tree)); foreach ($iterator as $key => $value) { if ($key == "selected" && $value) { $selectedValues[] = $iterator["key"]; } } var_dump($selectedValues);