|null $values * @param string $type primitive type or class string */ public static function validateCollectionValues($values, string $type): void { if (is_array($values)) { foreach ($values as $value) { $debugType = get_debug_type($value); if ($type !== $debugType && !is_subclass_of($value, $type)) { throw new UnexpectedValueException("Collection of type=$type contains value of type=$debugType"); } } } } }