PHP Abstraction

Advantages of Data Abstraction

• Implementation details of the class are protected from the unexpected user-level errors, which corrupt the state of the object.
• It helps to avoids the code duplication.
• It helps to reuse the code and provide partitioning of the code across the classes.

Abstract Class

A class which has declared as abstract is known as an abstract class. It has abstract methods and non-abstract methods. An abstract class consist of declaration as well as definition. It is a class that can't instantiated.

An abstract class is used as a base class for the deriving purpose only. An abstract class can't create an object.

 abstract class A{
	//Abstract methods
    //Non-Abstract methods
}

Abstract Method

A method which has declared as abstract and it doesn't have implementation details is known as an abstract method.

 abstract void method_name();//no method body

Example:

<?php
// Abstract class
abstract class Shape {
    abstract public function draw();
}

// Rectangle class extends Shape
class Rectangle extends Shape {
    public function draw() {
        echo "Drawing of the rectangle\n";
    }
}

// Circle class extends Shape
class Circle extends Shape {
    public function draw() {
        echo "Drawing of the circle\n";
    }
}

// Main execution
$s = new Circle();
$s1 = new Rectangle();

$s->draw();
$s1->draw();
?>