[Demiurge]

I maintain an early 2000's php website that is pretty functional and has a lot of features, but uses the classic spaghetti code. I can't exactly just switch to PDO without considerable time investment, and otherwise things are working just fine. I don't think this is an uncommon scenario.

[generalpf]

I converted an OSS application that I wrote back in '03 to PDO in just a few hours. It actually helped me find security holes because of strong typing in bound parameters. Have a go!