I updated PHP7.3 & 7.2 with PLESK(Web UI). Then a problem occurred with the use of Redis 5.0.3.
I confirmed with redis-cli command, which reacted normally.
I am using Nextcloud. I can not use NC in PHP 7.3.2 (or 7.2.15) that I updated. Strictly speaking, user could not log in to NC user account...