'Head First design patterns' code PHP version of object oriented learning

The examples in the book are relatively easy to understand, but as they are written by foreigners, the habits of the examples are not very Chinese, which may look a little strange occasionally, and the language habits are not Chinese. Of course the & # 65533; The & # 65533; After reading this book, you can gain insight into what design patterns can and cannot solve for you (such as not replacing your coding).
I changed some of the code in the book to PHP. It should be easy to understand the concept of code and cooperation.

The strategy pattern

 
<?php 
 
//Flight behavior interface
interface FlyBehavior { 
public function fly(); 
} 
//It's a behavior interface
interface QuackBehavior { 
public function quack(); 
} 
//Wings to fly
class FlyWithWings implements FlyBehavior { 
public function fly() { 
echo "I'm flying!!n"; 
} 
} 
//Can't fly
class FlyNoWay implements FlyBehavior { 
public function fly() { 
echo "I can't fly!n"; 
} 
} 
class FlyRocketPowered implements FlyBehavior { 
public function fly() { 
echo "I'm flying with a rocket!n"; 
} 
} 
class Qquack implements QuackBehavior { 
public function quack() { 
echo "Quackn"; 
} 
} 
class Squeak implements QuackBehavior { 
public function quack() { 
echo "Squeakn"; 
} 
} 
class MuteQuack implements QuackBehavior { 
public function quack() { 
echo "<< Silence >>n"; 
} 
} 
abstract class Duck { 
protected $quack_obj; 
protected $fly_obj; 
public abstract function display(); 

public function performQuack() { 
$this->quack_obj->quack(); 
} 
public function performFly() { 
$this->fly_obj->fly(); 
} 
public function swim() { 
echo "All ducks float, even decoys!n"; 
} 
public function setFlyBehavior(FlyBehavior $fb) { 
$this->fly_obj = $fb; 
} 
public function setQuackBehavior(QuackBehavior $qb) { 
$this->quack_obj = $qb; 
} 
} 

class ModelDuck extends Duck { 
public function __construct() { 
$this->fly_obj = new FlyNoWay(); 
$this->quack_obj = new MuteQuack(); 
} 
public function display() { 
echo "I'm a model duck!n"; 
} 
} 

$model = new ModelDuck(); 
$model->performFly(); 
$model->performQuack(); 
//Provide new capabilities
$model->setFlyBehavior(new FlyRocketPowered()); 
$model->setQuackBehavior(new Squeak()); 
$model->performFly(); 
$model->performQuack(); 

?> 

A singleton

 
<?php 
 
class MyClass { 
private static $uniqueInstance; 
private function __construct() { 

} 
public static function getInstance() { 
if (self::$uniqueInstance == null) { 
self::$uniqueInstance = new MyClass(); 
} 
return self::$uniqueInstance; 
} 
} 
$myClass = MyClass::getInstance(); 
var_dump($myClass); 
$myClass = MyClass::getInstance(); 
var_dump($myClass); 
?> 

Factory method model

 
<?php 
abstract class PizzaStore { 
public function orderPizza($type) { 
$pizza = $this->createPizza($type); 

$pizza->prepare(); 
$pizza->bake(); 
$pizza->cut(); 
$pizza->box(); 
return $pizza; 
} 

public abstract function createPizza($type); 
} 
class NYPizzaStore extends PizzaStore { 
public function createPizza($type) { 
if ($type == "cheese") { 
return new NYStyleCheesePizza(); 
} elseif ($type == "veggie") { 
return new NYStyleVeggiePizza(); 
} elseif ($type == "clam") { 
return new NYStyleClamPizza(); 
} elseif ($type == "papperoni") { 
return new NYStylePapperoniPizza(); 
} else { 
return null; 

} 
} 
} 
class ChicagoPizzaStore extends PizzaStore { 
public function createPizza($type) { 
if ($type == "cheese") { 
return new ChicagoStyleCheesePizza(); 
} elseif ($type == "veggie") { 
return new ChicagoStyleVeggiePizza(); 
} elseif ($type == "clam") { 
return new ChicagoStyleClamPizza(); 
} elseif ($type == "papperoni") { 
return new ChicagoStylePapperoniPizza(); 
} else { 
return null; 
} 
} 
} 
abstract class Pizza { 
public $name; 
public $dough; 
public $sauce; 
public $toppings = array(); 

public function prepare() { 
echo "Preparing " . $this->name . "n"; 
echo "Yossing dough...n"; 
echo "Adding sauce...n"; 
echo "Adding toppings: n"; 
for ($i = 0; $i < count($this->toppings); $i++) { 
echo " " . $this->toppings[$i] . "n"; 
} 
} 

public function bake() { 
echo "Bake for 25 minutes at 350n"; 
} 

public function cut() { 
echo "Cutting the pizza into diagonal slicesn"; 
} 

public function box() { 
echo "Place pizza in official PizzaStore boxn"; 
} 

public function getName() { 
return $this->name; 
} 
} 

class NYStyleCheesePizza extends Pizza { 
public function __construct() { 
$this->name = "NY Style Sauce and cheese Pizza"; 
$this->dough = "Thin Crust Dough"; 
$this->sauce = "Marinara Sauce"; 

$this->toppings[] = "Grated Reggiano Cheese"; 
} 
} 

class NYStyleVeggiePizza extends Pizza { 
public function __construct() { 
$this->name = "NY Style Sauce and veggie Pizza"; 
$this->dough = "Thin Crust Dough"; 
$this->sauce = "Marinara Sauce"; 

$this->toppings[] = "Grated Reggiano veggie"; 
} 
} 
class NYStyleClamPizza extends Pizza { 
public function __construct() { 
$this->name = "NY Style Sauce and clam Pizza"; 
$this->dough = "Thin Crust Dough"; 
$this->sauce = "Marinara Sauce"; 

$this->toppings[] = "Grated Reggiano clam"; 
} 
} 
class NYStylePapperoniPizza extends Pizza { 
public function __construct() { 
$this->name = "NY Style Sauce and papperoni Pizza"; 
$this->dough = "Thin Crust Dough"; 
$this->sauce = "Marinara Sauce"; 

$this->toppings[] = "Grated Reggiano papperoni"; 
} 
} 

class ChicagoStyleCheesePizza extends Pizza { 
public function __construct() { 
$this->name = "Chicago Style Deep Dish Cheese Pizza"; 
$this->dough = "Extra Thick Crust Dough"; 
$this->sauce = "Plum Tomato Sauce"; 

$this->toppings[] = "Shredded Mozzarella Cheese"; 
} 

public function cut() { 
echo "Cutting the pizza into square slicesn"; 
} 
} 

$myStore = new NYPizzaStore(); 
$chicagoStore = new ChicagoPizzaStore(); 
$pizza = $myStore->orderPizza("cheese"); 
echo "Ethan ordered a " . $pizza->getName() . "n"; 

$pizza = $chicagoStore->orderPizza("cheese"); 
echo "Ethan ordered a " . $pizza->getName() . "n"; 

?> 

The factory pattern

 
<?php 
abstract class PizzaStore { 
public function orderPizza($type) { 
$pizza = $this->createPizza($type); 

$pizza->prepare(); 
$pizza->bake(); 
$pizza->cut(); 
$pizza->box(); 
return $pizza; 
} 

public abstract function createPizza($type); 
} 
class NYPizzaStore extends PizzaStore { 
public function createPizza($type) { 
$pizza = null; 
$ingredientFactory = new NYPizzaIngredientFactory(); 
if ($type == "cheese") { 
$pizza = new CheesePizza($ingredientFactory); 
$pizza->setName('New York Style Cheese Pizza'); 
} elseif ($type == "veggie") { 
$pizza = new VeggiePizza($ingredientFactory); 
$pizza->setName('New York Style Veggie Pizza'); 
} elseif ($type == "clam") { 
$pizza = new ClamPizza($ingredientFactory); 
$pizza->setName('New York Style Clam Pizza'); 
} elseif ($type == "papperoni") { 
$pizza = new PapperoniPizza($ingredientFactory); 
$pizza->setName('New York Style Papperoni Pizza'); 
} 
return $pizza; 
} 
} 
class ChicagoPizzaStore extends PizzaStore { 
public function createPizza($type) { 
if ($type == "cheese") { 
return new ChicagoStyleCheesePizza(); 
} elseif ($type == "veggie") { 
return new ChicagoStyleVeggiePizza(); 
} elseif ($type == "clam") { 
return new ChicagoStyleClamPizza(); 
} elseif ($type == "papperoni") { 
return new ChicagoStylePapperoniPizza(); 
} else { 
return null; 
} 
} 
} 
interface PizzaIngredientFactory { 
public function createDough(); 
public function createSauce(); 
public function createCheese(); 
public function createVeggies(); 
public function createPepperoni(); 
public function createClam(); 
} 
class NYPizzaIngredientFactory implements PizzaIngredientFactory { 
public function createDough() { 
return new ThinCrustDough(); 
} 
public function createSauce() { 
return new MarinaraSauce(); 
} 
public function createCheese() { 
return new ReggianoCheese(); 
} 
public function createVeggies() { 
$veggies = array( 
new Garlic(), 
new Onion(), 
new Mushroom(), 
new RedPepper(), 
); 
return $veggies; 
} 
public function createPepperoni() { 
return new SlicedPepperoni(); 
} 
public function createClam() { 
return new FreshClams(); 
} 
} 
class ChicagoPizzaIngredientFactory implements PizzaIngredientFactory { 
public function createDough() { 
return new ThickCrustDough(); 
} 
public function createSauce() { 
return new PlumTomatoSauce(); 
} 
public function createCheese() { 
return new Mozzarella(); 
} 
public function createVeggies() { 
$veggies = array( 
new BlackOlives(), 
new Spinach(), 
new EggPlant(), 
); 
return $veggies; 
} 
public function createPepperoni() { 
return new SlicedPepperoni(); 
} 
public function createClam() { 
return new FrozenClams(); 
} 
} 
abstract class Pizza { 
public $name; 
public $dough; 
public $sauce; 
public $veggies = array(); 
public $cheese; 
public $pepperoni; 
public $clam; 

public abstract function prepare(); 

public function bake() { 
echo "Bake for 25 minutes at 350n"; 
} 

public function cut() { 
echo "Cutting the pizza into diagonal slicesn"; 
} 

public function box() { 
echo "Place pizza in official PizzaStore boxn"; 
} 

public function getName() { 
return $this->name; 
} 

public function setName($name) { 
$this->name = $name; 
} 

public function __toString() { 

} 
} 

class CheesePizza extends Pizza { 
public $ingredientFactory; 

public function __construct(PizzaIngredientFactory $ingredientFactory) { 
$this->ingredientFactory = $ingredientFactory; 
} 

public function prepare() { 
echo "Preparing " . $this->name . "n"; 
$this->dough = $this->ingredientFactory->createDough(); 
$this->sauce = $this->ingredientFactory->createSauce(); 
$this->cheese = $this->ingredientFactory->createCheese(); 
} 
} 

class ClamPizza extends Pizza { 
public $ingredientFactory; 

public function __construct(PizzaIngredientFactory $ingredientFactory) { 
$this->ingredientFactory = $ingredientFactory; 
} 

public function prepare() { 
echo "Preparing " . $this->name . "n"; 
$this->dough = $this->ingredientFactory->createDough(); 
$this->sauce = $this->ingredientFactory->createSauce(); 
$this->cheese = $this->ingredientFactory->createCheese(); 
$clam = $this->ingredientFactory->createClam(); 
} 
} 

$nyPizzaStore = new NYPizzaStore(); 
$nyPizzaStore->orderPizza('cheese'); 
?> 

Observer mode

 
<?php 
 
interface Subject { 
public function registerObserver(Observer $o); 
public function removeObserver(Observer $o); 
public function notifyObservers(); 
} 
interface Observer { 
public function update($temperature, $humidity, $pressure); 
} 
interface DisplayElement { 
public function display(); 
} 
class WeatherData implements Subject { 
private $observers = array(); 
private $temperature; 
private $humidity; 
private $pressure; 
public function __construct() { 
$this->observers = array(); 
} 
public function registerObserver(Observer $o) { 
$this->observers[] = $o; 
} 
public function removeObserver(Observer $o) { 
if (($key = array_search($o, $this->observers)) !== false) { 
unset($this->observers[$key]); 
} 
} 
public function notifyObservers() { 
foreach ($this->observers as $observer) { 
$observer->update($this->temperature, $this->humidity, $this->pressure); 
} 
} 
public function measurementsChanged() { 
$this->notifyObservers(); 
} 
public function setMeasurements($temperature, $humidity, $pressure) { 
$this->temperature = $temperature; 
$this->humidity = $humidity; 
$this->pressure = $pressure; 
$this->measurementsChanged(); 
} 
} 
class CurrentConditionsDisplay implements Observer, DisplayElement { 
private $temperature; 
private $humidity; 
private $weatherData; 
public function __construct(Subject $weatherData) { 
$this->weatherData = $weatherData; 
$weatherData->registerObserver($this); 
} 
public function update($temperature, $humidity, $pressure) { 
$this->temperature = $temperature; 
$this->humidity = $humidity; 
$this->display(); 
} 
public function display() { 
echo " Temperature: " . $this->temperature . ";  Humidity: " . $this->humidity . "%n"; 
} 
} 
class StatistionsDisplay implements Observer, DisplayElement { 
private $temperature; 
private $humidity; 
private $pressure; 
private $weatherData; 
public function __construct(Subject $weatherData) { 
$this->weatherData = $weatherData; 
$weatherData->registerObserver($this); 
} 
public function update($temperature, $humidity, $pressure) { 
$this->temperature = $temperature; 
$this->humidity = $humidity; 
$this->pressure = $pressure; 
$this->display(); 
} 
public function display() { 
echo " Temperature: " . $this->temperature . ";  Humidity: " . $this->humidity . "%;  Pressure: " . $this->pressure . "n"; 
} 
} 
$weatherData = new WeatherData(); 
$currentDisplay = new CurrentConditionsDisplay($weatherData); 
$statistionDisplay = new StatistionsDisplay($weatherData); 
$weatherData->setMeasurements(10, 20, 30); 
$weatherData->removeObserver($currentDisplay); 
$weatherData->setMeasurements(30, 40, 50); 
?> 

Command mode

 
<?php 

class Light { 
public function __construct() { 

} 

public function on() { 
echo "Light Onn"; 
} 

public function off() { 
echo "Light Offn"; 
} 
} 

interface Command { 
public function execute(); 
} 

class LightOnCommand implements Command { 
public $light; 

public function __construct(Light $light) { 
$this->light = $light; 
} 

public function execute() { 
$this->light->on(); 
} 
} 

class SimpleRemoteControl { 
public $slot; 

public function __construct() { 

} 

public function setCommand(Command $command) { 
$this->slot = $command; 
} 

public function buttonWasPressed() { 
$this->slot->execute(); 
} 
} 

class RemoteControlTest { 
public static function main() { 
$remote = new SimpleRemoteControl(); 
$light = new Light(); 
$lightOn = new LightOnCommand($light); 
$remote->setCommand($lightOn); 
$remote->buttonWasPressed(); 
} 
} 

RemoteControlTest::main(); 

?> 

Decorator mode

 
<?php 
 
abstract class Beverage { 
public $description = "Unknown Beverage"; 

public function getDescription() { 
return $this->description; 
} 

public abstract function cost(); 
} 

abstract class CondimentDecorator extends Beverage { 
//This is an abstract class in JAVA code, which PHP doesn't allow
public function getDescription() { 
return $this->description; 
} 
} 

class Espresso extends Beverage { 
public function __construct() { 
$this->description = "Espresso"; 
} 

public function cost() { 
return 1.99; 
} 
} 

class HouseBlend extends Beverage { 
public function __construct() { 
$this->description = "HouseBlend"; 
} 

public function cost() { 
return .89; 
} 
} 

class DarkRoast extends Beverage { 
public function __construct() { 
$this->description = "DarkRoast"; 
} 

public function cost() { 
return .99; 
} 
} 

class Mocha extends CondimentDecorator { 
public $beverage; 

public function __construct(Beverage $beverage) { 
$this->beverage = $beverage; 
} 
public function getDescription() { 
return $this->beverage->getDescription() . ", Mocha"; 
} 
public function cost() { 
return .20 + $this->beverage->cost(); 
} 
} 

class Whip extends CondimentDecorator { 
public $beverage; 

public function __construct(Beverage $beverage) { 
$this->beverage = $beverage; 
} 
public function getDescription() { 
return $this->beverage->getDescription() . ", Whip"; 
} 
public function cost() { 
return .10 + $this->beverage->cost(); 
} 
} 

class Soy extends CondimentDecorator { 
public $beverage; 

public function __construct(Beverage $beverage) { 
$this->beverage = $beverage; 
} 
public function getDescription() { 
return $this->beverage->getDescription() . ", Soy"; 
} 
public function cost() { 
return .15 + $this->beverage->cost(); 
} 
} 

$beverage = new Espresso(); 
echo $beverage->getDescription() . "n"; 
$beverage2 = new DarkRoast(); 
$beverage2 = new Mocha($beverage2); 
$beverage2 = new Mocha($beverage2); 
$beverage2 = new Whip($beverage2); 
echo $beverage2->getDescription() . " $" . $beverage2->cost() . "n"; 

$beverage3 = new HouseBlend(); 
$beverage3 = new Soy($beverage3); 
$beverage3 = new Mocha($beverage3); 
$beverage3 = new Whip($beverage3); 
echo $beverage3->getDescription() . " $" . $beverage3->cost() . "n"; 
?> 

The state pattern

 
<?php 

class GumballMachine { 
const SOLD_OUT = 0; 
const NO_QUARTER = 1; 
const HAS_QUARTER = 2; 
const SOLD = 3; 

public $state = self::SOLD_OUT; 
public $count = 0; 

public function __construct($count) { 
$this->count = $count; 
if ($count > 0) { 
$this->state = self::NO_QUARTER; 
} 
} 

public function insertQuarter() { 
if ($this->state == self::HAS_QUARTER) { 
echo "You can't insert another quarter!n"; 
} else if ($this->state == self::NO_QUARTER) { 
$this->state = self::HAS_QUARTER; 
echo "You inserted a quarter!n"; 
} else if ($this->state == self::SOLD_OUT) { 
echo "You can't insert a quarter, the machine is sold out!n"; 
} else if ($this->state == self::SOLD) { 
echo "Please wait, we're already giving you a gumball!n"; 
} 
} 
} 

$obj = new GumballMachine(0); 
print_r($obj) 

?>