[taspeotis]

> databases that only offer positional parameters (mysql, mssql).

Something between PHP and MSSQL must not support named parameters, because MSSQL supports them just fine.

[eli]

So does MySQL, actually. They are just allegedly slow (though I've never benchmarked and I wouldn't be surprised if that's no longer the case).

[DCoder]

Actually, Microsoft's SQLSRV PDO driver supports named parameters.