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[skip ci] Link technical resources in CONTRIBUTING.md #11155

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19 changes: 19 additions & 0 deletions CONTRIBUTING.md
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Expand Up @@ -14,6 +14,7 @@ had several contributions accepted, commit privileges are often quickly granted.
* [Pull requests](#pull-requests)
* [Filing bugs](#filing-bugs)
* [Feature requests](#feature-requests)
* [Technical resources](#technical-resources)
* [Writing tests](#writing-tests)
* [Writing documentation](#writing-documentation)
* [Getting help](#getting-help)
Expand Down Expand Up @@ -85,6 +86,24 @@ You may also want to read
[The Mysterious PHP RFC Process](https://blogs.oracle.com/opal/post/the-mysterious-php-rfc-process-and-how-you-can-change-the-web)
for additional notes on the best way to approach submitting an RFC.

## Technical resources

There are a number of technical resources on php-src. Unfortunately, they are
scattered across different websites, and often outdated. Nonetheless, they can
provide a good starting point for learning about the fundamentals of the code
base.

* https://www.phpinternalsbook.com/
* https://www.npopov.com/
* [Internal value representation](https://www.npopov.com/2015/05/05/Internal-value-representation-in-PHP-7-part-1.html), [part 2](https://www.npopov.com/2015/06/19/Internal-value-representation-in-PHP-7-part-2.html)
* [HashTable implementation](https://www.npopov.com/2014/12/22/PHPs-new-hashtable-implementation.html)
* [Zend Virtual Machine](https://www.npopov.com/2017/04/14/PHP-7-Virtual-machine.html)
* [How opcache works](https://www.npopov.com/2021/10/13/How-opcache-works.html), [opcache optimizer](https://www.npopov.com/2022/05/22/The-opcache-optimizer.html)
* https://wiki.php.net/internals
* https://qa.php.net/phpt_details.php
* https://phpinternals.net/
* https://blog.ircmaxell.com/categories/PHP/

## Writing tests

We love getting new tests! PHP is a huge project and improving test coverage is
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