Fix #81429: Handle resizing in SplFixedArray::offsetSet (#7487)

offsetSet did not account for the fact that the array may no longer exist after
the field is overwritten. This fixes that.

Fix #81429: Handle resizing in SplFixedArray::offsetSet (#7487)

offsetSet did not account for the fact that the array may no longer exist after
the field is overwritten. This fixes that.

Add test of resizing both to the empty array and a smaller array - there should
be no valgrind warnings with a proper fix.

Alternate approach to #7486 (described in https://bugs.php.net/bug.php?id=81429)

show more ...