Remove xfail from tests that do not fail anymore (#10871)

Reduce the scope of XFAIL (#8592)

Revert "XFAIL tests (GH-8588)"

This reverts commit f2ac4f206a5c68d9a25c352e6eb830bc942bc130.

XFAIL tests (GH-8588)

Don't use separate static variables in inherited methods

RFC: https://wiki.php.net/rfc/static_variable_inheritance

Closes GH-6719.

Migrate skip checks to --EXTENSIONS--, p3

For rationale, see #6787

Extensions migrated in part 3:
* ftp
* gmp
* iconv
* opcache
* shmop

Fix static variable behavior with inheritance

When a method is inherited, the static variables will now always
use the initial values, rather than the values at the time of
inheritan

Fix static variable behavior with inheritance

When a method is inherited, the static variables will now always
use the initial values, rather than the values at the time of
inheritance. As such, behavior no longer depends on whether
inheritance happens before or after a method has been called.

This is implemented by always keeping static_variables as the
original values, and static_variables_ptr as the modified copy.

Closes GH-6705.

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Fix static variable in methods inheritance during preloading

This is now "bug compatible" with the normal behavior, and more
imporantly, does not crash :)