Online PHP editor | refs for 7Oh09

<?php $combined = array( 'A' => array( 'B' => array( 'C' => array(null, null), ), 'D' => array( 'K' => array(null, null), ) ), ); $stack = array(&$combined); while (null !== ($ptr = &array_pop($stack))) { $null_count = 0; foreach ($ptr as $key => $value) { if (is_array($value)) { $stack[] = &$ptr[$key]; } elseif (null === $value) { ++$null_count; } } if (count($ptr) === $null_count) { $ptr = null; } } print_r($combined);