Factory Design Pattern example

Factory.php

<?php

	/*
	*
	* Factory Design Pattern
	* -----------------------
	* Wiki: In class-based programming, the factory method pattern is a creational pattern that uses factory methods to deal with the problem of creating 
	* objects without having to specify the exact class of the object that will be created. This is done by creating objects by calling a factory 
	* method—either specified in an interface and implemented by child classes, or implemented in a base class and optionally overridden by derived 
	* classes—rather than by calling a constructor.
	*
	*/


	interface Cook{
		public function cookMeal($time);
	}

	class CookPizza implements Cook{

		public function cookMeal($time = 1){
			echo "Cooking pizza for ". $time . " hour and its ready.\r\n";
		}
	}

	class CookPasta implements Cook{

		public function cookMeal($time = 1){
			echo "Cooking pasta for ". $time . " hour and its ready.\r\n";
		}
	}

	class CookBeans implements Cook{

		public function cookMeal($time = 1){
			echo "Cooking beans for ". $time . " hour and its ready.\r\n";
		}
	}

	// Our Cooking Factory
	class CookingFactory{

		public function mealChoice( $meal = null ){

			switch ($meal) {
			    case null:
			    	echo "Nothing to cook.\r\n";
			        break;
			    case "pizza":
			        return new CookPizza();
			    case "pasta":
			        return new CookPasta();
			    case "beans":
			        return new CookBeans();
			    default:
			    	echo "I cannot cook this.\r\n";
			}

		}
	}


	//Client Code

	//Get a factory instance
	$foodFactory = new CookingFactory();

	//Use the instance to get the instance you want
	$nothing 	= $foodFactory->mealChoice();
	$pasta 		= $foodFactory->mealChoice("pasta");
	$beans 		= $foodFactory->mealChoice("beans");
	$notCooking = $foodFactory->mealChoice("Cake");
	$pizza 		= $foodFactory->mealChoice("pizza");


	//Start Cooking
	$pasta->cookMeal();
	$beans->cookMeal();
	$pizza->cookMeal();

	


?>