Online PHP editor | refs for Y71BO

<?php $filters = []; print_r(array_key_exists('ids', $filters) ? $filters['ids'] : $filters); print_r($filters['ids'] ?? $filters); $filters['ids'] = null; print_r(array_key_exists('ids', $filters) ? $filters['ids'] : $filters); print_r($filters['ids'] ?? $filters); $filters['ids'] = '123'; print_r(array_key_exists('ids', $filters) ? $filters['ids'] : $filters); print_r($filters['ids'] ?? $filters);