What are the benefits of php singleton pattern

The singleton mode is a very frequently used mode. However, since there is usually no high concurrency on the client side, it does not matter which implementation method is chosen. Influence. Even so, due to efficiency considerations, I would recommend using DCL (check twice and lock once) and static inner classes to implement singletons.

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Benefits:

(1) Due to single The singleton mode has only one instance in the memory, which reduces memory expenses. Especially when an object needs to be created and destroyed frequently, and the performance cannot be optimized during creation or destruction, the singleton mode is very obvious.

(2) Since the singleton mode only generates one instance, it reduces the performance overhead of the system. When the generation of an object requires more resources, such as reading the configuration and generating other dependent objects, you can This is solved by directly generating a singleton object when the application starts, and then permanently resident in the memory.

(3) The singleton mode can avoid multiple occupation of resources, such as a file writing operation. Since only one instance exists in the memory, simultaneous operations on the same resource file are avoided.

(4) The singleton mode can set a global access point in the system to optimize and share resource access. For example, you can design a singleton class to be responsible for the mapping processing of all data tables.

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