Inheritance in PHP OOP

Posted 8 years ago By Ajay Gupta 26986

Inheritance in PHP

Inheritance is the php oops concept which is based around the concept of base classes or superclasses and derived classes or subclasses.

Base classes or Super Classes are also known as parent classes and similarly, derived classes or subclasses are known as child classes.

In the real world as a child take features from their parents, Same way in oops, child class inherit properties of their parent class with the help of inheritance.

We use `extends` keyword to implement inheritance in php.

Advantage of using inheritance in php oops, we can share properties of one class to other class.

What is inheritance in PHP ?

Inheritance in php is nothing but a well-established programming principle.The class which is being extend by other class is known as parent class, and the class which extend other class is known as child class.

By using inheritance in php, we can re-use of our code in object model.

Which type of inheritance supports in php ?

Multilevel or Multiple inheritance in PHP ?

Here is a sample code example which tell you the concept of inheritance in php oop which means how you will use inheritance in php, where you will use extend keyword.

class Parent {
// The parent’s class code
}
class Child extends Parent {
// The child can use the parent's class code
}

class Parent {// The parent’s class code}class Child extends Parent {// The child can use the parent's class code}

In the example given below, the SportsCar class inherits the LuxuryCar class which means now child class `SportsCar` has ability to access all methods and properties of parent class `LuxuryCar` that are not private.

//The base class
class LuxuryCar {
   // Private property inside the class
   private $model;
  //Public setter method
   public function setModel($model) {
      $this -> model = $model;
   }
   public function hi() {
   return "beep! beep! I am a " . $this -> model . "
";
   }
 }
//The child class get the code from the base class
class SportsCar extends LuxuryCar {
  //No code in the child class
}
//Create an object from the child class
$sportsCar1 = new SportsCar();
// Set the value of the class’ property.
// For this aim, we use a method that we created in the base
$sportsCar1 -> setModel('Ferrari');
//Use another method that the child class extended from the base class
echo $sportsCar1 -> hi();

//The base classclass LuxuryCar {   // Private property inside the class   private $model;  //Public setter method   public function setModel($model) {      $this -> model = $model;   }   public function hi() {   return "beep! beep! I am a " . $this -> model . "";   } }//The child class get the code from the base classclass SportsCar extends LuxuryCar {  //No code in the child class}//Create an object from the child class$sportsCar1 = new SportsCar();// Set the value of the class’ property.// For this aim, we use a method that we created in the base$sportsCar1 -> setModel('Ferrari');//Use another method that the child class extended from the base classecho $sportsCar1 -> hi();

Output :

beep! beep! I am a Ferrari