Provides active connection to MySQL DB.

One of 5 MySQL credentials are passed to the function as one of the following strings:

1. admin
2. delete
3. insert
4. update
5. select

Each level of access should include the capabilities of those below it. MySQL accounts must be setup for each level, with 'select' account only able to access db via 'select' command, and update able to 'select' and 'update' etc. Each credential set must exist in MySQL before it can be used.

The function returns an active connection to the DB.

If no data is entered into conn() function when it is called, the default access is 'admin'.

If only one credential is available, place it in the 'admin' position, and no parameter is required.

• return: active connection to MySQL db.
• todo: error logging, or emailing admin not implemented

• string $access: represents level of access