/usr/lib/tmpfiles.d/php7.2-fpm.conf is in php7.2-fpm 7.2.3-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | #Type Path Mode UID GID Age Argument
d /run/php 0755 www-data www-data - -
|