PHP object instantiation singleton method

PHP method of instantiating an object singleton:

Three private and one public: 2 private methods, 1 private property, 1 public method

private function __construct(){} //不可以继承构造方法
private function __clone(){}//不可以继承克隆方法
privare static $_instance;

一公

public static function getinstance(){
　　　　if(!isset(static:$_instance)){
　　　　　　static::$_instance=new static();
　　　　　　}
　　　　　　return static::$_instance;
　　}

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