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HomeBackend DevelopmentPHP TutorialLearning PHP Strategy Pattern - Quoted from 'In-depth PHP Object-Oriented Pattern and Practice'

#策略(Strategy)模式

#定义抽象类  Lesson
abstract class Lesson{
	private $duration;	
	private $coststrategy;		#定义属性

public function __construct($duration , CostStrategy $strategy){    
	#实例化时,传进来一个对象
	#用CostStrategy 类来处理 某个行为,而不用调用自身的方法来处理

	$this->duration =$duration;
	$this->coststrategy = $strategy;
}

public function cost(){
	return $this->coststrategy->cost($this);     #  ??? ??? ??? ??? ??? ??? ??? ??? ???
}		
#不是用抽象类的 abstract CostStrategy 类 中的方法 cost 来实现的,										
#从输出的值看来  是用的 
#TimedCostStrategy
#FixedCostStrategy  中 的方法,所以
# 在实例化对象时,用了  
#TimedCostStrategy
#FixedCostStrategy  中 的方法


public function chargeType(){
	return $this->coststrategy->chargeType();
}

public function getDuration(){
	return $this->duration;
}

}


abstract class CostStrategy{  					#抽象类是不能实例化的
	abstract function cost( Lesson $lesson); 	 	#传入的参数是对象
	abstract function chargeType();
}

class TimedCostStrategy extends CostStrategy{
	public function cost(Lesson $lesson){
		
		return ($lesson->getDuration()*5);   		
		#  在Lesson 类中,getDuration 的返回值是 return $this->duration;
	}

	public function chargeType(){
		return 'hourly rate!';
	}

}

class FixedCostStrategy extends CostStrategy{
	function cost(Lesson $lesson){
		return 30;
		#此处为调用如何方法,只是单纯的返回一个值
	}

	function chargeType(){
		return 'fixed rate';
	}
}

#继承类Lesson
class Lecture extends Lesson{

}

#继承类Lesson  
class Seminar extends Lesson{

}

#实例化对象
$lessons[] = new Seminar(4,new TimedCostStrategy());    #生成了一个TimeConsTrategy的一个对象 
$lessons[]= new Lecture(4 , new FixedCostStrategy());	#生成了一个FixedConsTrategy的一个对象

#分别 调用TimeConsTrategy && FixedConsTrategy 中的方法 const() 和 chargeType(),在执行遍历
foreach ($lessons as $lesson) {
	# 遍历输出
	print "lesson charge  {$lesson->cost()}==>>";		
	print "Charge type:   {$lesson->chargeType()}<br>";
}

The above introduces the learning of PHP strategy mode - quoted from "In-depth PHP Object-oriented Pattern and Practice", including aspects of the content, I hope it will be helpful to friends who are interested in PHP tutorials.

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