ABSTRACT CLASS

An abstract class is a mix between an interface and a class. It can be define functionality as well as interface.

  • Classes extending an abstract class must implement all of the abstract methods defined in the abstract class.
  • An abstract class is declared the same way as classes with the addition of the 'abstract' keyword.

SYNTAX:

snippet
abstract class MyAbstract
{
	//Methods
}
//And is attached to a class using the extends keyword.
class Myclass extends MyAbstract
{
	//class methods
}

Example 1

snippet
<?php
abstract class a
{
abstract public function dis1();
abstract public function dis2();
}
class b extends a
{
public function dis1()
	{
		echo "javatpoint";
	}
	public function dis2()
	{
		echo "SSSIT";	
	}
}
$obj = new b();
$obj->dis1();
$obj->dis2();
?>

Output:

ABSTRACT CLASS

Example 2

snippet
<?php
abstract class Animal
{
    public $name;
    public $age;
public function Describe()
    	{
        		return $this->name . ", " . $this->age . " years old";    
    	}
abstract public function Greet();
   	}
class Dog extends Animal
{
public function Greet()
    	{
        		return "Woof!";    
    	}
    
    	public function Describe()
    	{
        		return parent::Describe() . ", and I'm a dog!";    
    	}
}
$animal = new Dog();
$animal->name = "Bob";
$animal->age = 7;
echo $animal->Describe();
echo $animal->Greet();
?>

Output:

ABSTRACT CLASS
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