Answer / dhanya

Inheritance is the extension of a class. A child class has
all the properties and methods of its parent class. For
example, pets generally share similar characteristics,
regardless of what type of animal they are. Pets eat, and
sleep, and can be given names. However the different types
of pet also have their own methods: dogs bark and cats meow.
Below is an implementation of this:

<?php
class Pet
{
var $_name;

function Pet($name)
{
$this->_name = $name;
}

function eat()
{
}

function sleep()
{
}
}

class Dog extends Pet
{
function bark()
{
}
}

class Cat extends Pet
{
function meow()
{
}
}

$dog = new Dog("Max");
$dog->eat();
$dog->bark();
$dog->sleep();

$cat = new Cat("Misty");
$cat->eat();
$cat->meow();
$cat->sleep();
?>

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