PHP 8 compatibility for Magento Coding Standards

[github-jira-sync-bot]

 

What should be done

1. Fix issues reported by dev-develop PHPCompatibility check:

composer config repositories.phpcompatibility vcs "https://github.com/PHPCompatibility/PHPCompatibility"
composer config minimum-stability dev
composer require phpcompatibility/php-compatibility:dev-develop
./vendor/bin/phpcs -p . --standard=PHPCompatibility

2. Check and fix the areas not yet covered by PHPCompatibility on develop branch:

PHPCompatibility/PHPCompatibility#809

3. Update PHP version in composer.json to include "~8.0.0"

4. Update dependencies to versions supporting PHP 8 in composer.json. Ensure the project can be installed by the composer on both PHP 8 and PHP 7.4 environments.

5. Deliver the changes to develop branch

6. Release new version of Magento Coding Standards

7. Update Magento Coding Standards version in Magento (composer.lock) and Marketplace

[github-jira-sync-bot]

The issue was exported from the internal Jira. The link to the original Jira issue: https://jira.corp.magento.com/browse/AC-189

[m2-assistant]

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[ihor-sviziev]

This issue depends on #33622

[andrewbess]

Currently this project is compatibility with PHP 8.