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.
Why do we use interface in PHP?
Importance of using Interfaces:
Interface allows unrelated classes to implement the same set of methods regardless of their positions in the class inheritance hierarchy. Interface enables you to model multiple inheritance.
What do you define in 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.
WHAT IS interface and example?
An interface is a description of the actions that an object can do… for example when you flip a light switch, the light goes on, you don’t care how, just that it does. In Object Oriented Programming, an Interface is a description of all functions that an object must have in order to be an “X”.
What is an interface and why interface?
An interface is a reference type in Java. It is similar to class. It is a collection of abstract methods. … Along with abstract methods, an interface may also contain constants, default methods, static methods, and nested types. Method bodies exist only for default methods and static methods.
Why do we use interfaces?
Why do we use interface ? It is used to achieve total abstraction. Since java does not support multiple inheritance in case of class, but by using interface it can achieve multiple inheritance . It is also used to achieve loose coupling.
What is interface vs abstract class?
Difference between abstract class and interface
| Abstract class | Interface |
|---|---|
| 3) Abstract class can have final, non-final, static and non-static variables. | Interface has only static and final variables. |
| 4) Abstract class can provide the implementation of interface. | Interface can’t provide the implementation of abstract class. |
WHAT IS interface and types of interface?
User interface, or UI, describes the way in which a human interacts with a machine. … Command Line Interface. Menu-driven Interface. Graphical User Interface. Touchscreen Graphical User Interface.
Is interface a class?
No, an interface is not a class in Java. An interface is a type and all reference types (i.e. non-primitive types) handle quite similarly in Java. Often when people say “class” they are actually referring to a “reference type”.
CAN interfaces have methods?
The interface body can contain abstract methods, default methods, and static methods. … All abstract, default, and static methods in an interface are implicitly public , so you can omit the public modifier.
What is the difference between interface and class?
Differences between a Class and an Interface:
A class can be instantiated i.e, objects of a class can be created. An Interface cannot be instantiated i.e, objects cannot be created. Classes does not support multiple inheritance. Interface supports multiple inheritance.
What is a abstract method?
An abstract method is a method that is declared without an implementation (without braces, and followed by a semicolon), like this: abstract void moveTo(double deltaX, double deltaY);
CAN interface have variables?
An interface can have methods and variables just like the class but the methods declared in interface are by default abstract (only method signature, no body, see: Java abstract method). Also, the variables declared in an interface are public, static & final by default.
What are the three types of interfaces?
Comparing the Different Types of Interfaces
- Graphical User Interface. A graphical user interface (GUI) is used to describe any type of digital interface that accepts input via a keyboard, mouse or similar device. …
- Human Machine Interface. …
- Direct Manipulation Interface. …
- Touch User Interface. …
- Hardware Interfaces.
What is the difference between abstract class and interface in PHP?
Abstract class does contain a data member. … An interface class only contains incomplete members which refer to the signature of the member. Abstract class contains both incomplete(i.e. abstract) and complete members. Since everything is assumed to be public, an interface class does not have access modifiers by default.
Can interface implement 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.