Functional programming is comparatively new for PHP developers as the support for its prerequisites was added as of version 5.4. The emergence of functional programming will require us to understand the paradigm and write pure functions that are free of any side effects when required. PHP has some good support for writing functional programming code and, with that, we can also write functional data structures and algorithm implementations as we have tried to show in this book. In the near future, it might come in handy for optimizing and improving our application's efficiency.
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