Inheritance in PHP

Inheritance is one of the important features of object-oriented programming (OOP). It allows a class to inherit the properties and behaviors of another class. In PHP, you can use the keyword extends to establish an inheritance relationship between classes. Here is an example:

class Animal {
  protected $name;
  protected $type;
  
  public function __construct($name, $type) {
    $this->name = $name;
    $this->type = $type;
  }
  
  public function getName() {
    return $this->name;
  }
  
  public function getType() {
    return $this->type;
  }
}
class Dog extends Animal {

  public function bark() {

    echo "Woof!";

  }

}
// Create a new Dog object

$myDog = new Dog("Max", "Canine");
// Call the getName() method inherited from Animal class

echo $myDog->getName(); // Output: Max
// Call the bark() method from Dog class

$myDog->bark(); // Output: Woof!

In this example, we have a parent class Animal that has two properties ($name and $type) and two methods (__construct() and getName()). The child class Dog extends the parent class Animal and adds a new method bark().

When we create a new Dog object, we can call the getName() method inherited from the Animal class. We can also call the bark() method from the Dog class.

Note that the protected keyword is used to make the properties of the Animal class accessible within the child Dog class, but not outside the class hierarchy.