PHP 8.4 missing changelog deprecation for gc_divisor

[nickdnk]

Hello

When upgrading to PHP 8.4, you can no longer set gc_divisor for session configuration to zero at runtime (and probably not in the INI either). This was possible on 8.3 without raising a notice, but this is not listed in the deprecation list at https://www.php.net/manual/en/migration84.deprecated.php under "Session".

[damianwadley]

This did make it into the NEWS during php/php-src@ff69f33 so it is a documentation issue.

That said, the calculation of whether to run the GC is officially gc_probability / gc_divisor, thus a value of zero is invalid. If that value made it to the actual implementation, there would be fun integer overflows and underflows involved and I think the result is an effective calculation of 0.5 + gc_probability / PHP_INT_MAX - so essentially 50%.

[nickdnk]

Whatever the math or implementation logic is; it accepted 0 before and doesn't now, so the deprecations list should reflect this change. Naturally, it's easy to fix, but still.