class Car extends Vehicle{
public $gas;
function __construct()
{
parent::__construct("car",4);
$this->gas = 100;
}
function drive(){
parent::drive();
$this->gas-= 5;
echo "Now I have $this->gas percent of gas left.<br>";}
}
$bike = new Bicycle("bell");
echo $bike->drive("bell"); //prints 'Riding a bike with 2 wheels'
echo '<br>';
$car = new Car();
echo $car->drive();//prints 'Driving a car with 4 wheels'
?>
</p>
<?php
/*
*
$_SESSION
$_POST
$_GET
<h2>Inheritance</h2>
<?php
$square = new Square();
if (property_exists($square, "hasSides")) {
echo "I have sides";
}
?>
<h2>Overriding Parent Methods</h2>
<?php
$vehicle = new Vehicle();
echo $vehicle->honk() . "<br/>";
$bicycle = new Bicycle();
echo $bicycle->honk() . "<br/>";
echo $bicycle->drive() . "<br/>";
?>
<h2>Using <code>const</code></h2>
<?php
// :: => scope resolution operator
if (Immortal::alive) {
echo "I live forever!";
}
?>
<h2><code>static</code> Keyword</h2>
<?php
echo Person::greet() . "<br/>";
echo Person::$shout . "<br/>";
?>
</body>
