How to Upgrade Symfony 2.8 to 3.4
Now it's much easier to jump from one LTS to another - with instant upgrades.
Recently, more and more issues pop-up at Symfony repository asking for automated upgrade:
I'm happy Symfony core team is supporting generic solution to all PHP-code upgrades ↓
To make a bad situation more complicated, this upgrade is also related to upgrading of PHP - Symfony 3.4 requires PHP 5.5.
I wrote about PHP upgrades before, but the main away is to upgrade one minor version at once:
- Symfony 2.8 → 3.0
- PHP 5.3 → 5.4
- Symfony 3.0 → 3.1
- Symfony 3.1 → 3.2
- PHP 5.4 → 5.5
- Symfony 3.2 → 3.3
- Symfony 3.3 → 3.4
If you split each of these lines into standalone pull-requests, you're the best!
You probably know I work almost part-time on the Rector project. I gather feedback from conferences and meetups all over Europe and try to make Rector better every day. Recently he also migrated between 2 PHP frameworks, because why not?
The PHP community gives me really positive vibes about going the right direction. That helps me to make PHP and Symfony sets more and more complete:
All you need to do to upgrade your PHP code is to install Rector and run particular upgrades.
Do you want to upgrade from Symfony 2.8 to 3.4?
composer require rector/rector --dev vendor/bin/rector process app src --level symfony28 vendor/bin/rector process app src --level symfony30 vendor/bin/rector process app src --level symfony31 vendor/bin/rector process app src --level symfony32 vendor/bin/rector process app src --level symfony33 vendor/bin/rector process app src --level symfony34
You still need to upgrade YAML files, but then you're ready to go.
Are you stuck on old PHP 5.3? Rector got you covered:
vendor/bin/rector process app src --level php53 vendor/bin/rector process app src --level php54 vendor/bin/rector process app src --level php55
Upgrade to Symfony 3.3 shrunk my configs to 1/5 of its original size. That's the #1 reason you want to upgrade. If you don't know what I'm talking about, check the diff post about those features. But wait, don't do it manually! This tool converts it all for you.
And that's how we upgrade in 2019 :)
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