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A comment on Zig self hosted compiler is now capable of building itself. Parent comment

Re:Zig self hosted compiler is now capable of building itself by tored on Sunday April 17, 2022 @08:34AM (#31060410)
Correct, garbage collector was added to PHP 5.3, prior to 5.3 PHP did only reference counting. PHP 5.3 was released in June of 2009.

Here is a series of articles that describes it in detail

https://www.php.net/manual/en/features.gc.php

Especially look at this example where the same script is executed with and without GC

https://www.php.net/manual/en/features.gc.performance-consid...

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