[php-src] Issue #8079: Recent patch to SplFixedArray causes array_walk + json encode to hang, circular var_export during gc to run out of memory

Issue: https://github.com/php/php-src/issues/8079 Comment Author: TysonAndre > Can SplFixedArray detect when it was changed and regenerate properties only in this case? That's probably possible, assuming that in practice, it won't change while var_export/debug_zval_dump is called, barring any PECL classes that misbehave during handlers.get_properties (not aware of any). After modification calls such as offsetSet/offsetUnset/setSize, set a boolean or bit flag in SplFixedArray's implementation indicating it was modified