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                    Hi internals!
Bug #75442[1] correctly mentions that the constants 
FILTER_FLAG_SCHEME_REQUIRED and FILTER_FLAG_HOST_REQUIRED are 
practically unused as of PHP 5.2.1.  (Well, they have been used in a 
single test case, but I have just removed them[2]).
So I suggest to deprecate these constants as of PHP 7.3, and to remove 
them as of PHP 8.0.  Would that require the RFC process?
[1] https://bugs.php.net/bug.php?id=75442 
[2] 
http://git.php.net/?p=php-src.git;a=commit;h=c4c4056041e26244dd511b0f36d7e3d14b1182c4
-- 
Christoph M. Becker