Example Analysis of php singleton pattern

Editor to share with you the example analysis of the php singleton pattern, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

The singleton pattern is mainly used for database connections, ensuring that there is only one instance of a class in the database, and providing this instance to the entire system. So as to avoid the consumption of resources by new operations and the occurrence of too many connection information in the database.

There are three main points: 1. There must be only one instance. two。 This instance must be created automatically. 3. This example must be provided to the entire system.

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