* (T206979) Fix PHP 7.3 warnings of using "compact()" when some variables may
not be set.
* Fix PHP 7.3 warnings "preg_replace(): [...] invalid range in character class"
* (T206979) Fix PHP 7.3 warnings of using "compact()" when some variables may
not be set.
* Fix PHP 7.3 warnings "preg_replace(): [...] invalid range in character class"