Add zend_test.observer.enabled=0 to opcache tests asserting specific TMP count

Necessary to succeed when tests are run with zend_test.observer.enabled=1.

Migrate skip checks to --EXTENSIONS--, p3

For rationale, see #6787

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

Add many missing closing PHP tags to tests

Closes GH-5958

Fix free of uninitialized memory in MATCH_ERROR

As suggested by Tyson Andre:
https://github.com/php/php-src/pull/5371#issuecomment-657081464

Also fix line number of unhandled ma

Fix free of uninitialized memory in MATCH_ERROR

As suggested by Tyson Andre:
https://github.com/php/php-src/pull/5371#issuecomment-657081464

Also fix line number of unhandled match error

Closes GH-5841.

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Implement match expression

RFC: https://wiki.php.net/rfc/match_expression_v2

Closes GH-5371.