Add validation to the form you created in the previous tutorial and how Symfony supports different kinds of forms
Services are a way to cut up an application in to bite size chunks and they are the cornerstone of a quality app removing bloat from controllers and opening up doors to a maintainable app. In this tutorial, I guide you through what they mean to Symfony, how to use them, and how to create them.
Event listeners offer a way to create milestones in your code as hooks which can have further functionality plug in very easily.
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