Example of Dynamic Generation for Submitted Forms by Events in Symfony 6. In the moment of exploring this topic, Symfony guidelines are only mentioning simple implementation based on POST_SUBMIT event.

• Symfony 6
• PHP 8

mkdir symfony-dynamic-forms 
cd symfony-dynamic-forms
git clone -b main https://github.com/kapcus/symfony-dynamic-forms.git .
composer install

symfony server:start

open the symfony server url in browser (e.g. https://localhost:8000/)

You will see 2 links:

Test PRE SUBMIT form - this is fully functional dynamic form based on PRE_SET_DATA and PRE_SUBMIT events.

Test POST SUBMIT form - this is not functional implementation based on PRE_SET_DATA and POST_SUBMIT events.

• To share PRE_SUBMIT implementation
• Verify if there is any drawback of PRE_SUBMIT implementation
• If so, find a way how to implement it with POST_SUBMIT