Magento 2 on PHP 8.3 and 8.4: Fixing Compatibility Issues
How to move Magento 2 code to PHP 8.3 and 8.4: the deprecations that break extensions, how to find them with PHPCompatibility, Rector and PHPStan, and fixes.
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Articles about Upgrade
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Magento 2.4.8 Upgrade Checklist: Step by Step
A practical checklist for upgrading Magento Open Source or Adobe Commerce to 2.4.8: stack requirements, extension checks, Composer steps, testing and go live.