How to inherit a class php

I think the best way for beginners to understand inheritance is through a real example so here is a simple example I can gave to you 

<?php

class Person
{
    public $name;
    protected $age;
    private $phone;

    public function talk(){
        //Do stuff here
    }

    protected function walk(){
        //Do stuff here
    }

    private function swim(){
        //Do stuff here
    }
}

class Tom extends Person
{
    /*Since Tom class extends Person class this means 
        that class Tom is a child class and class person is 
        the parent class and child class will inherit all public 
        and protected members(properties and methods) from
        the parent class*/

     /*So class Tom will have these properties and methods*/

     //public $name;
     //protected $age;
     //public function talk(){}
     //protected function walk(){}

     //but it will not inherit the private members 
     //this is all what Object inheritance means
}

Source: php.net

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