php设计模式之单例模式的示例分析

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具体内容如下

rndId = rand();    }    public function whatAmI(){      echo 'I am a Apple(' . $this->rndId . ')
';    }    public static function getInstance(){      //echo get_class();      return Fruit::getSingleton(get_class());    }  }  class GreenApple extends Apple{    public function whatAmI(){      echo 'I am a GreenApple(' . $this->rndId . ')
';    }    public static function getInstance(){      return Fruit::getSingleton(get_class());    }  }  $apple1 = Apple::getInstance();  //var_dump($apple1);  $apple2 = GreenApple::getInstance();  $apple1->whatAmI();// should echo 'I am a Apple(some number)  $apple2->whatAmI();// should echo 'I am a GreenApple(some number)  $apple1 = Apple::getInstance();  $apple2 = GreenApple::getInstance();  //保证单例模式  $apple1->whatAmI();// should echo 'I am a Apple(same number as above)  $apple2->whatAmI();// should echo 'I am a GreenApple(same number as above)  // $a = clone $apple1;// this should fail  // $b = clone $apple2;// this should fail

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