We need to decide ASAP about all the PHP/DB/Moodle versions requirements and put all them into the environmental tests (adding them to all supported branches).

All the still open linked issues have been also cloned here from the 4.3 sister issue (MDL-76724).

Usual discussions:

• PHP min. version/supported versions.
• database versions.
• Linked issues.
• ...

Feel free to propose areas to be discussed here. A numbered list with all them will be created to vote and decide the final outcomes of this issue.

 Related Tasks (create issues/PRs whenever they apply):

TODO-0: Recommendation. It's useful to look to the changes performed for previous versions, specially LTS ones, to see which sort of changes must be applied with this issue. Specially remember that any change to the minimum supported PHP always implies a change to the minimum upgradeable Moodle version (to the first one supporting the new PHP requirement).

TODO-1: Once the agreement is settled, if there are raised requirements (PHP/Database/Extensions...) create a MDLSITE issue to ensure that external testers environment is ready for them.

TODO-2: Once the agreement is settled, create a MDL issue about to guarantee that all the Community sites sites running the dev version fulfil the new requirements.

TODO-3: Once the agreement is settled, warn (apart from the previous points) about the agreed changes, listing them, so everybody is ready in advance for the upcoming changes. This includes:

• Integration exposed post.
• General dev chat.
• Internal dev chats.

TODO-4: - MDL-80313 - Composer: To be done as part of this issue (main only):

1. Raised lower PHP version does imply that core composer stuff need to be updated and regenerated with it.
2. Also, check that all the php and extensions requirements and recommendations in the composer.json file match the ones specified in the admin/environment.xml file (defined by this issue).

TODO-5: Environment and upgrade: To be done as part of this issue:

1. Add the new version section to the admin/environment.xml files, for all the supported (security included) branches. Ensure all the new requirements are applied.
2. If Moodle requirements have changed, remove any upgrade step (and upgradelib functions) not used anymore (main only).

TODO-6: GHA integration: To be done as part of this issue (main only). Ensure requirements are fulfilled and there are jobs using the new versions.

TODO-7: phpcs.xml.dist : To be done as part of this issue (main only). Ensure that the testVersion config setting matches the range of PHP supported versions. Note that for main branch we leave the range open always.

TODO-8: Once the agreement is settled, ensure that:

• The affected php docker images fulfill all the requirements (extensions...).
• Same for (still) non-dockered stuff, like:
  • Legacy CI server. Ensure that both main jobs and CiBoT runs are executed with minimum supported php version.
  • Performance-comparison jobs.

TODO-9: Once the patch is ready to peer-review, update all the configuration @ CI infrastructure:

• Ensure (nightlyjobs) that every Moodle branch knows its lowest and highest PHP supported versions.
• Verify that the runner (moodle-ci-runner) is using correct database versions.
• Configure the following jobs if there is a PHP version bump:
  1. All "bulk-prelaunch" jobs (5), in the "Tracker" tab, configure main branch run using the new PHP version.
  2. All "developer requested" jobs (4), in the "Testing" tab, configure them to run by default using the new PHP version (moving it to the top of the list in the available PHP versions list, unless they already have a newer version).

TODO-10: Once applied upstream, changes are needed @ download.moodle.org to show the new requirements there (serverscripts).

TODO-11: (Mac missing) - Once applied upstream, ensure that both the Mac and Windows packages fulfill the requirements and work ok.

TODO-12: Once applied upstream, warn (apart from the previous points) about the imminent changes, listing them, so everybody is ready in advance for the upcoming changes. This includes:

• Integration exposed post.
• General dev chat.
• Internal dev chats.

TODO-13: Once applied upstream, review the travis (only moodle-plugin-ci) and github actions configuration for various repositories. The new core requirements may be hitting them. Also add new branches if missing. Known to need review / fix repos include:

• PR#276 - moodle_docker (both own GHA and default php/db versions if raised)
• (no changes) - moodle-plugin-ci
• (no changes) - moodle-cs
• PR#224 - local_codechecker
• PR#126 - local_moodlecheck
• PR#8 - webservice_xmlrpc
• (no changes) - local_ci
• ...

TODO-14: Consider if there is any PHPUnit upgrade to perform whenever there are PHP version changes.

• PHPUnit 10 has been released, but we aren't in a hurry to upgrade. More yet, it only supports PHP 8.1 and up, so we cannot update to it until that PHP version is made a requirement for Moodle.

TODO-15: Ensure that the (clone of this) issue for next (to this) requirements issue is created and contains all the information. All the non-resolved details and issues must be dragged to the new issue.

TODO-16: Docs:

1. If there is any raise to PHP requirements, document it the PHP docs page (example PR).
2. Ensure that all the requirements are shown in the corresponding docs (release and/or upgrade). Ask @ devdocs if the new version docs need to be created (example issue).
3. Ensure that there are landing pages @ docs for all the environmental changes performed.

TIA and ciao