3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $array = array( array("title" => 1, "children" => array( array( "selected" => true, "key" => 100, "children" => array() ) ), array( "selected" => true, "key" => 200, "children" => array( array( "selected" => true, "key" => 300, "children" => array( array( "selected" => true, "key" => 400, "children" => array() ) ) ) ) ) ) ); $selectedValues = array(); $iterator = new \RecursiveIteratorIterator(new \RecursiveArrayIterator($array)); foreach ($iterator as $key => $value) { if ($key == "selected") { $depth = $iterator->getDepth(); $subIterator = $iterator->getSubIterator($depth); foreach ($subIterator as $key2 => $value2) { if ($key2 == "key") { echo $value2 . PHP_EOL; } } } }
based on l7hL4
Output for 5.4.0 - 7.2.0
100 200