php设计模式——策略模式

来源：互联网发布：淘宝2016创业成功案例编辑：程序博客网时间：2024/06/06 12:59

/** * 商场活动1，打折优惠收费方式，策略1 */class CashRebate{public $rebate;//打折额度<=1，正常收费情况下等于1 public function setActive($moneyRebate){$this->rebate = $moneyRebate;}//具体实现收取现金方法public function acceptCash($money){return $money * $this->rebate;}}/** * 商场活动2，返现金收费方式，策略2 */class CashReturn{public $moneyCondition;public $moneyReturn;public function setActive($moneyCondition, $moneyReturn){$this->moneyCondition = $moneyCondition;$this->moneyReturn = $moneyReturn;}//实现收费现金方法public function acceptCash($money){if($money >= $this->moneyCondition){return $money - $this->moneyReturn;}else{return $money;}}}/** * 简单工厂模式和策略模式相结合 */class cashContext{public $obj;//工厂模式，生成对应的处理策略对象public function __construct($type){switch ($type) {case 'rebate':$this->obj = new CashRebate();break;case 'return':$this->obj = new CashReturn();break;}}//为各种情况的对象，设置参数public function setRebate($rebate){$this->obj->setActive($rebate);}public function setReturn($ondition, $return){$this->obj->setActive($ondition, $return);}//最终获取实收用户现金的方法public function acceptMoney($money){return $this->obj->acceptCash($money);}}//活动1使用：$totalMoney = 1000; //商品总金额$rebate = 0.8; //活动折扣$cashObj = new cashContext('rebate');$cashObj->setRebate($rebate);$cashObj->acceptMoney($totalMoney);

策略模式是用来封装各种算法的，在实践中可以用策略模式来封装各种业务的规则，减少了各种算法类和使用算法类的耦合

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