--TEST-- Test array_push() function : error conditions - max int value as key --FILE-- 'max'); var_dump(array_push($array, 'new')); var_dump($array); echo "Done"; ?> --EXPECTF-- *** Testing array_push() : error conditions *** Warning: array_push(): Cannot add element to the array as the next element is already occupied in %s on line %d bool(false) array(1) { [%d]=> string(3) "max" } Done