php设计模式之策略模式应用案例详解

<?php
/**
 * Created by PhpStorm.
 * Author: zhaorui
 * Date: 2019/2/27
 * Time: 10:55
 */
header('Content-Type:text/html;charset=utf-8');
// 抽象策略接口
abstract class Strategy{
  abstract function wayToSchool();
}
//具体策略角色
class BikeStrategy extends Strategy{
  function wayToSchool()
  {
    echo "骑自行车去上学".PHP_EOL;
  }
}
class BusStrategy extends Strategy{
  function wayToSchool()
  {
    echo "乘公共汽车去上学".PHP_EOL;
  }
}
class TaxiStrategy extends Strategy{
  function wayToSchool()
  {
    echo "坐出租去上学".PHP_EOL;
  }
}
// 环境角色
class Context{
  private $strategy;
  function getStrategy($strategyName){
    try{
      $strategyReflection = new ReflectionClass($strategyName);
      $this->strategy = $strategyReflection->newInstance();
    }catch (ReflectionException $e){
      $this->strategy = "";
    }
  }
  function goToSchool(){
    $this->strategy->wayToSchool();
  }
}
// 测试
$context  = new Context();
$context->getStrategy('BusStrategy');
$context->goToSchool();