pattern-abstract-class-function.php

<?php

defined( 'NDA' ) || exit('Access Denied.');

/**
 * Pattern Abstract Class Function
 *
 * @link http://www.primitivetype.com/articles/php_5_abstract_classes_and_methods.php
 */

/**
 * Abstract Class Vehicle.
 */
abstract class Vehicle
{
	/**
	 * Public abstract function Gets the Number of Wheels
	 */
	public abstract function getNumWheels();

	/**
	 * Public function Gets the Name
	 */
	public function getName()
	{
		return get_class($this);
	}
}

/**
 * Class Car Extends Vehicle.
 */
class Car extends Vehicle
{
	/**
	 * Public Function Gets the Number of Wheels.
	 */
	public function getNumWheels()
	{
		return 4;
	}
}

/**
 * Class Bike Extends Vehicle.
 */
class Bike extends Vehicle {

	/**
	 * Public Function Gets the Number of Wheels.
	 */
	public function getNumWheels()
	{
		return 2;
	}
}

/**
 * Prints (echos) the number of wheels.
 */
function printNumWheels(Vehicle $v)
{
	echo "A " . $v->getName() . " has " . $v->getNumWheels() . " wheels\n";
}

$car = new Car();
$bike = new Bike();

printNumWheels($car);
printNumWheels($bike);

/*
output:
A Car has 4 wheels
A Bike has 2 wheels
*/