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This article mainly shows you the "sample analysis of garbage collection mechanism in PHP", which is easy to understand and clear. I hope it can help you solve your doubts. Let the editor lead you to study and study the "sample analysis of garbage collection mechanism in PHP".

What is the garbage collection mechanism of PHP?

Description:

1) if you are familiar with the PHP source code, please start with the source code, answer some questions, and you will get extra points

2) if you are not familiar with the PHP source code, you can write as much as you can, including information from your programming intuition.

3) Yes, there are points, mistakes are not deducted, and there are no points if you do not write.

A: PHP can automatically manage memory and clear objects that are no longer needed. PHP uses a simple garbage collection (garbagecollection) mechanism called reference counting (referencecounting). Each object contains a reference counter, each reference is connected to the object, and the counter is added by 1. When reference leaves the living space or is set to NULL, the counter is minus 1. When an object's reference counter is 00:00, PHP knows that you will no longer need to use the object, freeing up its memory footprint.

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