《Head First 设计模式》代码之PHP版(面向对象学习)

时间:2022-09-16 18:50:25

书中的例子都比较浅显易懂,不过由于是外国佬写的,所以例子的习惯不是很附合中国特色,可能偶尔看起来有些别扭,还有语言习惯也不是中国风。当然看过这本书之后,你才能深刻理解设计模式到底能为你解决哪些问题,不能为你解决哪些问题(比如不能代替你的编码)。 
  我将书中部分代码改成PHP,看下代码再配合概念应该是比较容易理解了。 

策略模式 

复制代码代码如下:


<?php 
/** 
* 策略模式 
* 定义了算法族,分别封装起来,让它们之间可以互相替换, 
* 此模式让算法的变化独立于使用算法的客户。 
*/ 
//飞行行为接口 
interface FlyBehavior { 
public function fly(); 

//呱呱叫行为接口 
interface QuackBehavior { 
public function quack(); 

//翅膀飞行 
class FlyWithWings implements FlyBehavior { 
public function fly() { 
echo "I'm flying!! "; 


//不会飞 
class FlyNoWay implements FlyBehavior { 
public function fly() { 
echo "I can't fly! "; 


class FlyRocketPowered implements FlyBehavior { 
public function fly() { 
echo "I'm flying with a rocket! "; 


class Qquack implements QuackBehavior { 
public function quack() { 
echo "Quack "; 


class Squeak implements QuackBehavior { 
public function quack() { 
echo "Squeak "; 


class MuteQuack implements QuackBehavior { 
public function quack() { 
echo "<< Silence >> "; 


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! "; 

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! "; 



$model = new ModelDuck(); 
$model->performFly(); 
$model->performQuack(); 
//提供新的能力 
$model->setFlyBehavior(new FlyRocketPowered()); 
$model->setQuackBehavior(new Squeak()); 
$model->performFly(); 
$model->performQuack(); 

?> 


单件模式 

复制代码代码如下:


<?php 
/** 
* 单件模式 
* 确保一个类只有一个实例,并提供一个全局访问点。 
*/ 
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); 
?> 


工厂方法模式 

复制代码代码如下:


<?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 " . $this->name . " "; 
echo "Yossing dough... "; 
echo "Adding sauce... "; 
echo "Adding toppings: "; 
for ($i = 0; $i < count($this->toppings); $i++) { 
echo " " . $this->toppings[$i] . " "; 



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


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


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


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 slices "; 



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

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

?> 


工厂模式 

复制代码代码如下:


<?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 350 "; 


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


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


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 . " "; 
$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 . " "; 
$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'); 
?> 





观察者模式 

复制代码代码如下:


<?php 
/** 
* 观察者模式 
* 定义了对象之间的一对多依赖,当一个对象改变状态时, 
* 它的所有依赖者都会收到通知并自动更新。 
*/ 
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 "温度:" . $this->temperature . "; 湿度:" . $this->humidity . "% "; 


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 "温度:" . $this->temperature . "; 湿度:" . $this->humidity . "%; 气压:" . $this->pressure . " "; 


$weatherData = new WeatherData(); 
$currentDisplay = new CurrentConditionsDisplay($weatherData); 
$statistionDisplay = new StatistionsDisplay($weatherData); 
$weatherData->setMeasurements(10, 20, 30); 
$weatherData->removeObserver($currentDisplay); 
$weatherData->setMeasurements(30, 40, 50); 
?> 


命令模式 

复制代码代码如下:


<?php 

class Light { 
public function __construct() { 



public function on() { 
echo "Light On "; 


public function off() { 
echo "Light Off "; 



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(); 

?> 


装饰者模式 

复制代码代码如下:


<?php 
/** 
* 装饰着模式 
* 动态地将责任附加到对象上,若要扩展功能,装饰者提供了比继承更有弹性的替代方案。 
*/ 
abstract class Beverage { 
public $description = "Unknown Beverage"; 

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


public abstract function cost(); 


abstract class CondimentDecorator extends Beverage { 
//JAVA代码里这里是个抽象类,PHP不允许这么做 
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() . " "; 
$beverage2 = new DarkRoast(); 
$beverage2 = new Mocha($beverage2); 
$beverage2 = new Mocha($beverage2); 
$beverage2 = new Whip($beverage2); 
echo $beverage2->getDescription() . " $" . $beverage2->cost() . " "; 

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


状态模式 

复制代码代码如下:


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




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

?>