Online PHP editor | refs for Fig5b

<?php function prune_leaves($array) { foreach($array as $k => $v) { var_dump($v, NULL, $v === NULL); if ($v === NULL) unset($array[$k]); if (is_array($v)) prune_leaves($v); } return $array; } $test1 = ['a' => 123, 'b' => ['c' => null]]; var_dump(prune_leaves($test1));