Functors in PHP Programming
Explore the concept of functors in PHP programming by learning how to implement them through type classes and operator overloading. Understand the properties of functors such as identity and composition laws and see a practical example with a Calculator class that applies these principles. This lesson helps you grasp how to create immutable, polymorphic structures in PHP for functional programming.
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For languages like PHP that don’t have default userland functor supportA type class that implements functor-compatible methods is an effective replacement for the functor concept. The fantasyland package helps with functor compliance checks. It’s a PHP port of a more complex JavaScript package of the same name. In addition to the required functor design, the fantasyland project also includes verification of laws that functors must satisfy.
Functors are type classes
To effectively create a working functor, we need to implement the functor rubric—defined by category theory from the previous section—as a type class. A type class is a composite data type, which supports operator ...