[php-src] Issue #8156: Classes extending `SplFixedArray` can not implement `RecursiveIterator`

Issue: https://github.com/php/php-src/issues/8156 Comment Author: damianwadley There are multiple issues in here that you might be asking about: whether SplFixedArray should be an IteratorAggregate, whether implementing both Iterator and IteratorAggregate is a problem, whether the conflict should be reported as a fatal error... Apparently you asked about the first one. Yes: as of PHP 8.0, SplFixedArray uses IteratorAggregate instead of Iterator. https://www.php.net/manual/en/migration80.incompatible.php#migration80.incompatible.spl