PHP's garbage collection mechanism is very important in any development language, and PHP's garbage collection mechanism allows developers to avoid memory leaks as much as possible during the development process, and to automatically reclaim variables by reference counting, but there are still memory leaks in certain, long-time scripts.
Basic principles and FAQs can be found in the official documentation, marked here to avoid omissions: http://php.net/manual/zh/features.gc.refcounting-basics.php
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