Singletons & Dependency Injection In WordPress
Singletons used to be very common in WordPress plugins. It used to be that singletons were the only way, besides global variables to have a globally available instance of a class in a WordPress plugin. This section covers why Singletons are not great and when it’s not a big deal. It will cover some ways to refactor plugins so they don’t have singletons.
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eBook: Refactoring WordPress Plugins Part 1
Refactoring A WordPress Plugin To Use A Container