I just installed php-mysql on Ubuntu 18:
apt install php-mysql
After that I noticed two new packages when running
apt list --installed:
php-mysql/bionic,bionic,now 1:7.2+60ubuntu1 all [installed] php7.2-mysql/bionic-updates,bionic-security,now 7.2.24-0ubuntu0.18.04.6 amd64 [installed,automatic]
I would expect only one new package. Why two packages where the only difference is the version number in the package name?