Upgrade Symfony 1_4 Project to Symfony 5

Question

I have a legacy application which uses

• Symfony 1_4
• PHP 5.3
• MySQL 5.6

Client is asking for an upgrade of all the tech stack to the latest.

• Symfony 5
• PHP 8
• MySQL 8

How can I do this upgrade with minimum effort ? A solution required without re-writing the whole application.

Upgraded application's security should be major feature

Answer 1

Upgrading from such an old version to the latest version is most likely never going to work. I suggest rebuilding the application in Symfony 5 manually, it will probably save you a lot time and effort.

You can try to reuse as much business logic as you can.