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database migration with data already in the database in production

I don't know much about migrations, but this is a specific question I'm not sure how to answer. In production, how can one change the database format/schema when there is already user data in there? ...
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Class/Object with different sets of configurations, singletons etc (PHP)

I want to produce maintainable code for configuring one or multiple classes differently depending whether in a production or development environment. For example, making a Paypal class/object that ...