Shulou(Shulou.com)05/31 Report--

In this article, the editor introduces in detail "what are the six commonly used design patterns in PHP", with detailed content, clear steps and proper handling of details. I hope that this article "what are the six common design patterns in PHP" can help you solve your doubts.

Singleton pattern features:

Three private and one public: private static variables (storing instances), private constructors (to prevent instance creation), private cloning methods (to prevent cloning of objects), public static methods (to provide instances to the outside world)

Application scenarios:

In the application of the program, when it comes to database operation, if you connect to the database each time, it will bring a lot of resource consumption. You can create unique database connection objects through singleton mode.

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