[symfony] Symfony2 : How to get form validation errors after binding the request to the form

Symfony 3 and newer

I recently made a function which creates a tree of form errors. This will be helpful for returning list of errors back to front-end. This is based on form types having:

'error_bubbling' => false

Code:

public static function getFormErrorsTree(FormInterface $form): array
{
    $errors = [];

    if (count($form->getErrors()) > 0) {
        foreach ($form->getErrors() as $error) {
            $errors[] = $error->getMessage();
        }
    } else {
        foreach ($form->all() as $child) {
            $childTree = self::getFormErrorsTree($child);

            if (count($childTree) > 0) {
                $errors[$child->getName()] = $childTree;
            }
        }
    }

    return $errors;
}

Output:

Array
(
    [name] => Array
        (
            [0] => This value is not valid.
        )

    [emails] => Array
        (
            [0] => Array
                (
                    [0] => Given e-mail is not valid.
                    [1] => Given e-mail is not valid #2.
                )
            [1] => Array
                (
                    [0] => Given e-mail is not valid.
                    [1] => Given e-mail is not valid #2.
                )

        )

)

Notice: I know that errors from deeper level fields can be overwritten if higher level has errors, but this is on purpose for my usage.