Feature: #107388 - PSR-14 to manipulate form before it is saved 

Description 

A new PSR-14 event \TYPO3\CMS\Form\Event\BeforeFormIsSavedEvent has been introduced. It serves as a direct replacement for the now removed hook $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/form']['beforeFormSave'] .

The new event is dispatched immediately before a form is saved in the backend.

The event provides the following public properties:

• $form: The form definition array
• $formPersistenceIdentifier: The form persistence identifier used to store the form

Example 

An example event listener could look like this:

namespace MyVendor\MyExtension\Form\EventListener;

use TYPO3\CMS\Core\Attribute\AsEventListener;
use TYPO3\CMS\Form\Event\BeforeFormIsSavedEvent;

final class BeforeFormIsSavedEventListener
{
    #[AsEventListener('my-extension/before-form-is-saved')]
    public function __invoke(BeforeFormIsSavedEvent $event): void
    {
        $event->form['label'] = 'foo';
    }
}

Impact 

With the new BeforeFormIsSavedEvent , it is now possible to modify a form definition as well as the form persistence identifier before it is saved.