What is a PHP interface

A PHP interface is a contract that classes can implement. It defines a set of methods that the implementing class must provide, but it does not contain any implementation itself. This allows for consistent method signatures across different classes while promoting code reusability and flexibility.

Interfaces are particularly useful in defining APIs or ensuring that certain classes adhere to a specific structure, without dictating how they should fulfill that contract.

<?php interface Animal { public function makeSound(); } class Dog implements Animal { public function makeSound() { return 'Woof!'; } } class Cat implements Animal { public function makeSound() { return 'Meow!'; } } $dog = new Dog(); echo $dog->makeSound(); // Outputs: Woof! $cat = new Cat(); echo $cat->makeSound(); // Outputs: Meow! ?>

PHP interface implementing interface method signatures code reusability flexibility in PHP

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