Agreed. No note of PDO or even mysqli anywhere, which is pretty unfortunate since novice programmers starting with PDO would be building safer apps.

Slightly off topic, but my rule of thumb: If your project is too big for Sqlite, it's big enough for Postgres. If it's too small for Postgres, it's small enough for Sqlite.

MySQL doesn't absolutely need to fit anywhere in the picture, but of course, this is precluding any host complications for existing projects.