PHP OOPs Inheritance - PHP Inheritance

PHP Inheritance

• Inheritance in PHP is a feature of Object-Oriented Programming (OOP) that allows a class to inherit the properties and methods of another class.
• It is a way of reusing code, and makes it easier to maintain and update the code.
• Inheritance is a very important concept in OOP, and it is used to extend the functionality of existing classes.

Sample Code

<?php
class Car {
  public $name;
  public $color;
  public function __construct($name, $color) {
    $this->name = $name;
    $this->color = $color;
  }
  public function answer() {
    echo "The car is {$this->name} and the color is {$this->color}.";
  }
}
// Volvo is inherited from Car
class Volvo extends Car {
  public function question() {
    echo "Am I a car or a van? ";
  }
}
$volvo = new Volvo("Volvo", "red");
$volvo ->question();
echo “<br>”;
$volvo ->answer();
?>

Output

Am I a car or a van?
The car is Volvo and the color is red.

PHP - Overriding Inherited Methods

• Inherited methods can be overridden by redefining the methods (use the same name) in the child class.

Sample Code

<?php
class Car {
  public $name;
  public $color;
  public function __construct($name, $color) {
    $this->name = $name;
    $this->color = $color;
  }
  public function message() {
    echo "The car is {$this->name} and the color is {$this->color}.";
  }
}

class Volvo extends Car {
  public $type;
  public function __construct($name, $color, $type) {
    $this->name = $name;
    $this->color = $color;
    $this->type = $type;
  }
  public function message() {
    echo "The car is {$this->name}, the color is {$this->color}, and the type is {$this->type}.";
  }
}
$volvo = new Volvo("Volvo", "black", "sedan");
$volvo->message();
?>

Output

The car is Volvo, the color is black, and the type is sedan.

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