Restrict allowed usages of $GLOBALS

This restricts allowed usage of $GLOBALS, with the effect that
plain PHP arrays can no longer contain INDIRECT elements.

RFC: https://wiki.ph

Restrict allowed usages of $GLOBALS

This restricts allowed usage of $GLOBALS, with the effect that
plain PHP arrays can no longer contain INDIRECT elements.

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

Closes GH-6487.

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