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On the existing system its use old MySQL functions.. I would like to replace it all to PDO but it would take a long time and a lot of testing.
Is it possible to mix PDO and MySQL Functions on the existing system? For example new pages/php files will use PDO… All the old files will still use old MySQL for time being and will be replaced slowly as system will continue to update..
Yes, it is perfectly fine to use both at the same time. Keep in mind, though, that you would need a seperate connection for either type and beware of the implications that arise from such an approach.