symfony - How to migrate AppBundle.php with Symfony4 update

Question

With the update of Symfony4, AppBundle/ will be abolished and will be under src/.
I have set the following actions in AppBundle.php, how is the best way to migrate?
Code
AppBundle.php

class AppBundle extends Bundle
{
    /**
     * {@inheritdoc}
     */
    public function boot()
    {
        parent::boot(); 

        // Make the container accessible from static methods
        Parameters::setContainer($this->container); 

         // Don't throw an exception when SwiftMailer uses an RFC-violating address(consecutive dots, @immediately preceding dot)
         // Change the regular expression for address checking.
         // (use reflection to change private variables)
        $swiftMimeGrammar = Swift_DependencyContainer::getInstance()->lookup('mime.grammar');
        $prop = new ReflectionProperty('Swift_Mime_Grammar', '_grammar');
        $prop->setAccessible(true);
        $_grammar = $prop->getValue($swiftMimeGrammar);
        $_grammar['addr-spec'] = '.*';
        $prop->setValue($swiftMimeGrammar, $_grammar);
    }

question from:https://stackoverflow.com/questions/65896065/how-to-migrate-appbundle-php-with-symfony4-update

Answer 1

Waitting for answers