Migrating from PHP 5.6 to PHP 7.2 with Magento

In this presentation, which takes less than 30 minutes, we will discuss the approach I used to migrate a large Magento 1 project from PHP 5.6 to PHP 7.2, before the official compatibility provided by Magento, and what are the results.

Transcript

1. Migrating from PHP 5.6 to PHP 7.2 with Magento
2. SOME CONTEXT 1/2 ▪ Project started in 2011... with PHP 5.3 ▪ More than 30 contributors 2 ▪ Code to migrate: ▫ ~ 11.500 classes ▫ ~ 1.900 templates
3. SOME CONTEXT 2/2 ▪ By the end of 2017, we were still on PHP 5.5 ▪ Unable to upgrade the legacy infrastructure… ▪ … even if the code is compatible with PHP 5.6 3
4. “ Let's migrate everything to AWS! 4
5. “ Why not take the opportunity to go further than just PHP 5.6? 5
6. SUPPORTED/UNSUPPORTED VERSIONS OF PHP * Release date Active support date Security support date PHP 5.5 20 Jun 2013 20 Jun 2015 21 Jul 2016 PHP 5.6 28 Aug 2014 28 Aug 2016 31 Dec 2018 PHP 7.0 3 Dec 2015 3 Dec 2017 10 Jan 2019 PHP 7.1 1 Dec 2016 1 Dec 2018 1 Dec 2019 PHP 7.2 30 Nov 2017 30 Nov 2019 30 Nov 2020 6 * By the time we were working on the migration.
7. PHP CHANGELOGS TL;DR: ▫ https://www.php.net/manual/en/migration70.php ▫ https://www.php.net/manual/en/migration71.php ▫ https://www.php.net/manual/en/migration72.php 7
8. 8 LOCAL ENVIRONMENT Thanks to Docker, the update was very easy.
9. 1. Analysis Find what we need to fix
10. MANUAL CHECKS 10
11. IDE CHECKS 11
12. PHP 7 COMPATIBILITY CHECKER (php7cc) “php7cc is a command line tool designed to make migration from PHP 5.3-5.6 to PHP 7 easier.” - Looks promising, but it’s no longer supported… 12
13. PHP STATIC ANALYSIS TOOL (phpstan) “PHPStan focuses on finding errors in your code without actually running it. It catches whole classes of bugs even before you write tests for the code.” - Nice! Let's give a try... 13
14. MAIN RESULTS Magento autoload Arithmetic with strings Automatic serialization 14 PHP deprecations Stash APC driver Mongo extension
15. Magento autoload 15
16. Arithmetic with strings 16
17. Automatic serialization 17
18. PHP deprecations 18
19. Stash APC driver 19
20. Mongo extension 20
21. BLACKFIRE 21
22. 2. Compatibility Fix the code which is out of date
23. “ Custom code = Search & Replace 23
24. “ Want to change dependencies? Don’t edit them, patch them! 24
25. 25 GENERATE PATCHES Use Git or your IDE to generate a patch from your local changes. PhpStorm documentation
26. 26 APPLY PATCHES Automatically apply a patch to packages installed with Composer. cweagans/composer-patches
27. 27 DROP USELESS CODE Too many errors in an unnecessary library? Just delete it.
28. “ Remember that even if all automated tests are green, the application will have to be tested intensively. 28
29. 3. Results Enjoy modernity
30. -38% on wall time -58% on memory usage -44% on CPU usage 30
31. Only the PHP version has changed Still not want to migrate? 31
32. 32 THANKS! ANY QUESTIONS? ▪ GitHub: ajardin ▪ Twitter: @alxjrdn ▪ E-mail: info@ajardin.fr