Simple example of Abstract Class and Extends Class

class_abstract.php

<?php 
    abstract class Person {

      protected $name;

      protected $age;

      public function __construct($name, $age) {

          $this->name = $name;

          $this->age = $age;

      }

      /*public function get_data() {

          return 'Name' . $this->name . ' Age: ' . $this->hability; 

      }*/

    }

    class Hero extends Person {

        protected $hability;

        public function __construct($name, $age, $hability) {
            parent::__construct($name, $age);
            $this->hability = $hability;
        }

        public function get_data() {

          return 'Name: ' . $this->name . ' Hability: ' . $this->hability . ' Age: ' . $this->age; 

      }
    }

    $hero = new Hero('Thor',30, 'GOD');

    echo $hero->get_data(); // Name: Thor Hability: GOD Age: 30
?>