--TEST-- Bug #75717: RecursiveArrayIterator does not traverse arrays by reference --FILE-- <?php function flatten(array $nestedArraysAndStrings){ $flat=[]; $iter = new RecursiveIteratorIterator( new RecursiveArrayIterator($nestedArraysAndStrings)); foreach($iter as $leaf){ $flat[] = $leaf; } return join(NULL, $flat); } $noRefs = [[[['some']]],[' nested '],"items"]; $withRefs = []+$noRefs; $wat = $noRefs[0]; $withRefs[0] = &$wat; echo flatten($noRefs), "\n"; echo flatten($withRefs), "\n"; ?> --EXPECT-- some nested items some nested items