php设计模式之单例模式代码,php设计模式_PHP教程
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2024-02-03 23:05:16
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php设计模式之单例模式代码,php设计模式
php设计模式之单例模式的例子,供大家参考,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
以上就是本文的全部内容,希望对大家学习php程序设计有所帮助。
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