Use the new features of PHP5.3 to implement the Singleton mode _ PHP Tutorial

Use the new features of PHP5.3 to implement the Singleton mode. 5.3 can also be implemented before, but the code is cumbersome, as follows: classMOrderextendsSModel {protectedstatic $ handle; example handle privatefunction _ construct () {something} *** can also be implemented before obtaining this class 5.3, but the code is cumbersome, as shown below:

Class MOrder extends SModel {
Protected static $ handle; // example handle

Private function _ construct (){
// Something
}

/**
* Obtain the method of this type of Singleton and publish it to the public.
*
* @ Return MOrder
*/
Public static function instance (){
If (self ::$ handle ){
Return self: $ handle;
}

$ Class = _ CLASS __;
Self: $ handle = new $ class ();
Return self: $ handle;
}

// Otherthing

}

5.3 added delayed static binding (this word is really awkward)

The code implementation is as follows:

Class SModel {
/**
* Gets the example handle and returns the instance objects of a specific model class.
*/
Protected static function instance (){
If (static ::$ handle ){
Return static: $ handle;
}

$ Class = get_called_class ();
Static: $ handle = new $ class ();
Return static: $ handle;
}

// Parent something

}

Class MGoods extends SModel {
/**
* Obtain the method of this type of Singleton and publish it to the public.
* @ Return MGoods
*/
Public static function instance (){
Return parent: instance ();
}
Protected static $ handle; // example handle
Protected function _ construct (){
// Something
}

// Otherthing

}

Through modification, the implementation code of the subclass is reduced by a part, which is implemented by the parent class.

To be honest, it is still very troublesome. If PHP implements singleton by itself.

Class MOrder extends SModel {protected static $ handle; // example handle private function _ construct () {// something}/*** get this class...