In Doctrine configuration reference (driver) I see pdo_mysql as a possible value, but not mysql, which is the one defined by default in Symfony (in DATABASE_URL).
I have checked that it’s using PDO even though mysql is defined as driver in DATABASE_URL, but I can’t find any reference. Is it an alias of pdo_mysql?
On the other hand, in the same reference page I see an example with pdo-mysql, not pdo_mysql. Is there any sort of transformation of driver within DATABASE_URL?
What are then all possible values for driver in DATABASE_URL?