PHP策略模式的代碼分享

PHP策略模式的代碼分享

<?php  // 策略模式    interface Calculator  {      public function calc($a, $b);  }    /**  * add strategy  */  class AddCalculator implements Calculator  {      public function calc($a, $b)      {          return intval($a) + intval($b);      }  }    /**  * multiply stategy  */  class MultiplyCalculator implements Calculator  {      public function calc($a, $b)      {          return intval($a) * intval($b);      }  }    // -------------------------------------------------------    /**  * sample code  */  class StrategySample  {      private $calc;        public function construct(Calculator $c = NULL)      {          if(!is_null($c))              $this->calc = $c;      }        /**      * set calculator      */      public function setCalculator(Calculator $c)      {          $this->calc = $c;      }        /**      * get calculator      */      public function getCalculator()      {          return $this->calc;      }        public function doCalc($a, $b)      {          return $this->calc->calc($a, $b);      }  }    // test code  $add = new AddCalculator();  $strategy = new StrategySample($add);  echo $strategy->doCalc(2, 3);    echo '<br>';  $strategy->setCalculator(new MultiplyCalculator());  echo $strategy->doCalc(2, 3);