What is a interface in PHP?

A PHP interface defines a contract which a class must fulfill. If a PHP class is a blueprint for objects, an interface is a blueprint for classes. 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.

What is interface with example in PHP?

PHP – What are Interfaces? Interfaces allow you to specify what methods a class should implement. Interfaces make it easy to use a variety of different classes in the same way. When one or more classes use the same interface, it is referred to as “polymorphism”.

Does PHP provide GUI?

The PHP-GTK is the first extension of the PHP language that lets you write client-side applications with GUI (Graphical User Interface).

Can we create instance of interface?

We can’t create an instance(interface can’t be instantiated) of the interface but we can make the reference of it that refers to the Object of its implementing class. A class can implement more than one interface.

Can an interface extend another interface PHP?

Every PHP programmer knows you can’t extend multiple classes with PHP. You can only do one – which is fine. In fact, if you need more shared code, make sure to focus on using traits instead.

Why do we use interface?

You use an interface to define a protocol of behavior that can be implemented by any class anywhere in the class hierarchy. Interfaces are useful for the following: Capturing similarities among unrelated classes without artificially forcing a class relationship.

How you can create an interface?

An interface is declared by using the interface keyword. It provides total abstraction; means all the methods in an interface are declared with the empty body, and all the fields are public, static and final by default. A class that implements an interface must implement all the methods declared in the interface.

How do I initiate an interface?

3) implements keyword is used by classes to implement an interface. 4) While providing implementation in class of any method of an interface, it needs to be mentioned as public. 5) Class that implements any interface must implement all the methods of that interface, else the class should be declared abstract.

Can an interface implement another interface?

An interface can extend any number of interfaces but one interface cannot implement another interface, because if any interface is implemented then its methods must be defined and interface never has the definition of any method.

How do you implement an interface in PHP?

To create an interface in PHP, all you must do is use the keyword interface followed by the name of the interface (any name). When you create a class that you want to implement that interface, you simply declare the class, as you would normally would and follow that line with implements name_of_interface.

How do interface constants work in PHP?

Interface constants work exactly like class constants . Prior to PHP 8.1.0, they cannot be overridden by a class/interface that inherits them. // allowed to override constants. // An abstract class may implement only a portion of an interface.

Can a class/interface override an interface in PHP?

Prior to PHP 8.1.0, they cannot be overridden by a class/interface that inherits them. // allowed to override constants. // An abstract class may implement only a portion of an interface.

How do you implement an interface in Java?

To implement an interface, a class must use the implements keyword. A class that implements an interface must implement all of the interface’s methods. From the example above, let’s say that we would like to write software which manages a group of animals.