Online PHP editor | refs for sM8A5

<?php $a = array(true, false, false, true); $ao = new ArrayObject($a); foreach ($a as $key => $value) { echo $key, "\n"; if (!$value) { unset($a[$key]); } } echo json_encode($a), "\n"; echo "\n"; foreach ($ao as $key => $value) { echo $key, "\n"; if (!$value) { unset($ao[$key]); } } echo json_encode($ao), "\n";