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This article mainly introduces "how to apply php singleton mode". In daily operation, I believe many people have doubts about how to apply php singleton mode. The editor consulted all kinds of data and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "how to apply php singleton mode". Next, please follow the editor to study!

Description

1. Singleton mode is very useful when you need to ensure that there is only one instance of an object. Control of the creation of the object is given to a single point, and the application exists only at any time, only one instance. Singletons should not be in an external instance of the class.

Be careful

2. A constructor with a level of private must be accessed to prevent the class from being randomly instantiated.

Static variables must have an instance of the saved class.

There must be a public static method to access this instance. This method is usually named getInstance ()

There must be a private, empty clone method to prevent it from being copied.

Example

Class Single {public static $_ instance; private function _ construct () {} private function _ _ clone () {} public static function getInstance () {if (! self::$_instance) {self::$_instance = new self ();} return self::$_instance;} public function sayHi () {echo "Hi\ n" } $single = Single::getInstance (); $single- > sayHi (); at this point, the study on "how to apply the php singleton pattern" is over, hoping to solve everyone's doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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