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PHP singleton pattern implementation

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Release： 2016-11-09 14:28:19
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test(); echo PHP_EOL; $b = Singleton::getInstance(); //第二次调用时不执行构造方法 $b->test(); echo PHP_EOL; //$c=new Singleton();由于构造方法私有，这个会报错的 //$d=clone $a;克隆对象报错
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