PDO php script implementation

[AlbusRex]

I have tried to rewrite the current mysql.php to a more generic implementation using php's PDO features and I think I have succeeded.
This implementation has been tested with NGINX and a Postgre storage backend and has been accessed by chromium and firefox based browsers.
On the backend getting PDO to work is very easy. Just by installing the corresponding php database module the PDO driver will become available.
I have not had the opportunity to test a different database storage unfortunately.

[TBlueF]

Looks very nice! Thank you for the efforts so far :)

I'll still need to test this on my end, but here are some things i noticed when reading over this quickly..

Additionally to the comments, i think naming the file sql.php instead of map_data_provider.php would be easier and more understandable for many users. If you agree, could you please rename the file to that instead? :)

[AlbusRex]

I have implemented the changes that were suggested.
I am a bit slow on the update since I am new to this workflow on github.

[TBlueF]

Thanks for the changes, looks good now :)
I'll test it as soon as i find some time and if everything works as expected it will be merged 👍

[TBlueF]

@AlbusRex Sorry for the very long time it took me to test this..

I had to change a couple of things to make this work on my end with mysql.
Can you please confirm that my changes didn't break anything, and it still works with PostgreSQL ? :)

[AlbusRex]

I have tested the changes and everything works as intended. I suspect we had one of those "by value vs by reference" kind of problems.