------Singleton mode of design pattern

From now on, let's start with the design pattern:

<?php/*** only one instance in memory, save memory space, * Avoid frequent creation of destroyed objects, can improve performance, * Avoid multiple occupancy of shared resources * can be accessed globally * the creation of objects is too much time consuming, the cost of the source too **//**private, So they are not inherited, but many other singleton patterns can be inherited, such as a registered singleton **//**** a Hungry man single case * * When the Singleton class is loaded, instantiate an object to its own reference **/public class  Singleton{     private static singleton singleton = new  singleton ();      private singleton ();      public  static singleton getinstance () {           return singleton;     }}/**** Lazy single case, the object can be instantiated when the instance method is obtained **/public class  singleton{     private static singleton singleton;      private singleton () {}     public static synchronized  Singleton getinstance () {          if (singleton ==  null) {               singleton = new singleton ();           }           return singleton;     }}

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------Singleton mode of design pattern