What we are saying above is: given a string $message, vocalize() will return what is heard as a string. Public function vocalize(string $message): string We could describe this as follows: interface Vocalizer The details of vocalization are specific to each type, but each can vocalize. In the real world, this could be a bird ("tweets"), a dog ("barks"), a cat ("meows"), or a human ("sings"). PHP Interface Basicsįor an example of PHP Interface basics, we will consider "something that vocalizes". Any class implementing a given interface can be expected to have the same behavior in terms of what can be called, how it can be called, and what will be returned. If a PHP class is a blueprint for objects, an interface is a blueprint for classes. Ability to Implement Multiple InheritanceĪ PHP interface defines a contract which a class must fulfill.What Can We Define In an PHP Interface?.Five Principles for Object-Oriented Programming.In this blog, we dive in on PHP interfaces, including basic concepts and terminology, the role of PHP interfaces in object-oriented programming, and more. PHP interfaces also allow you to substitute different implementations, regardless of normal class inheritance, giving you more flexibility in how your structure your applications. In particular, they allow you to create classes that have known, expected behaviors that fit within your own application architecture.
PHP interfaces provide reusable types detailing specific behaviors that your application can consume.
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