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This article mainly explains "php reference counting how to achieve garbage collection", the content of the article is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "php reference counting how to achieve garbage collection" bar!

Implementation description

1. Add a reference counter to the object, and the value of the reference counter increases each time it is referenced somewhere. Whenever the reference expires, the value of the counter is reduced by one.

If the refcount of the variable value minus one equals 0, the value will be released, not garbage. The garbage collector does not handle.

If the refcount of the variable value is greater than 0 after minus one, the value is considered not to be released and may become garbage.

2. The garbage collector collects the possible garbage and starts the garbage identification program after reaching a certain amount to release the real garbage.

Example

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