How to Instantly Upgrade your Legacy Symfony in Minutes?

Tomas Votruba

@votrubat

@rectorphp

Thank You 🙏

for Coming 

Hi, I'm Tomas...

...and I love legacy code 😍

What you Learn? 🤔

• how to upgrade Symfony quickly

• guide to sustainable code

• tips for extreeeemely lazy devs

• best practises for easy change

• demo 🧑‍💻

3 Years 😷 Later...

What is your Version?

(my guess)

Bad News 😢

• extra work every 6 months

• double the work every 12 months

• boring work

• BC breaks

• repeated work

Good News 😊

• all code base are the same

• MVC

• features

• input → output

• there are patterns

House Reconstruction?

• we need plan and design

• layers in right order

• have the tooling

• use the tooling well

• get the right people

"Go Fast, Go Alone

Go Far, Go together"

1. The Right Tooling

• Coding Standards

• PHPStan

• Type Coverage

• Rector

2. Plan The Order

• Symfony 2.8

• PHP 7.2

• PHP 7.3

• PHP 7.4

• Symfony 3.0

• Symfony 3.1 ...

3. Patch Around 😎

• clean /vendor, but in newer version
• symplify/vendor-patches

💻

💻

4. Lean Iterate 

• The smallest PR ever

• Work is always finished

• 1 rule at a time, don't be a hero

• Merge as fast as... Elon Musk fires people: 0, max 1 day

5. Type Coverage

• 3 types of "typed-code" 

  • no types

  • doc types

  • type declarations

💻

💻

5. Type Coverage

• measure it 

• put it in CI

• at least 80-90 % are you're in amazing shape 💪

💻

6. PHPStan Level 

• at least 3-4

• some types are more important than others

  • property fetch types

  • method call types

💻

No Baseline!

7. No YAML

• from dummy string to context

• use PHP awesome treesome

  • ECS

  • PHPStan

  • Rector

💻

💻

Also Slim Configs

• no tags

• autoconfigure

• PSR-4 autodiscovery

• move as much as you can away

8. The Last Upgrade

• solve it today, and forget it forever

• the same work in 2 years?

• let CI upgrade for you

  • 2 lines in code

💻

<Put DEMO here>

💻

9. Power of Community

• new PHP? → add a rule

• new Symfony? → add a rule

• new PHPUnit? → add a rule

10. The Senior Dev Code

• teach other devs

• move responsibility from people to the CI

• cooperate together

• open hands to develpers to work effectively

"How many people is needed to maintain company with single form?"

"How many people is needed to maintain company with single form?"

Now 3500 less...

11. Be Competetive

• grow

• be balsy

• try new tools

• ask for engaging work only

12. Ask for Best Quality

• no type changes

• no boring work

• no repeated work

• let Rector work for you so...

• ...you can refactor and improve code

Create Meaninful

Code you'll Love ❤️️

Slides + demo on @votrubaT today