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Reference counting
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===PHP=== [[PHP]] uses a reference counting mechanism for its internal variable management.<ref>{{Cite web|title=PHP: Reference Counting Basics - Manual|url=https://www.php.net/manual/en/features.gc.refcounting-basics.php|access-date=2020-10-01|website=www.php.net}}</ref> Since PHP 5.3, it implements the algorithm from Bacon's above mentioned paper. PHP allows you to turn on and off the cycle collection with user-level functions. It also allows you to manually force the purging mechanism to be run.
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