What is Interface in PHP? Back to Basics

An Interface allows the users to create programs, specifying the public methods that a class must implement, without involving the complexities and details of how the particular methods are implemented. It is generally referred to as the next level of abstraction. It resembles the abstract methods, resembling the abstract classes. An Interface is defined just like a class is defined but with the class keyword replaced by the interface keyword and just the function prototypes. The interface contains no data variables. The interface is helpful in a way that it ensures to maintain a sort of metadata for all the methods a programmer wishes to work on.

Interfaces are characterized similarly as a class, however, only the interface keyword replaces the class phrase in the declaration and without any of the methods having their contents defined.

Example

Let' create an interface and implement it with a simple example.

Explanation

Here we have declared an interface MyFirstInterface with two methods getName and getAge() inside it without any content. Then the class MyClass implements this interface and uses the available methods according to requirement.

Let's learn some important Characteristic of the interface:

1. An interface comprises of methods that have no content, which means the interface methods are abstract methods.
2. Every one of the methods in interfaces must have public visibility scope.
3. Interfaces are not quite the same as classes as the class can inherit from one class but the class can implement one or more interfaces.
4. No variables cant be present inside the interface.

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