PHP Single-instance mode

1<?PHP2 classSingleton {3     /**4 * Description: (1) static variable, save global instance, bind to class, independent of Object5 * (2) Private attribute, in order to avoid calling class name directly outside of class:: $instance, prevent null6      */7     Private Static $instance;8 9     /**Ten * Description: Privatization of constructors to prevent external instantiation of objects One      */ A     Private function__construct () { -     } -  the     /** - * Description: Privatization of cloning functions to prevent external cloning of objects -      */ -     Private function__clone () { +     } -  +     /** A * Description: Static method, single access unified portal at * @return Singleton: Returns the unique object instance in the app -      */ -      Public Static functiongetinstance () { -         if(! (Self::$instanceinstanceof Self)) { -Self::$instance=NewSelf (); -         } in         returnSelf::$instance; -     } to } +  -?>

PHP Single-instance mode