Gets symfony2 form errors as an array.

getErrorsForForm.php

<?php
    protected function getErrorsForForm(Form $form)
    {
        $errors = [];
        foreach ($form->all() as $child) {
            foreach ($child->getErrors() as $error) {
                $errors[$child->getName()][] = $error->getMessage();
            }
            if ($child->count() > 0) {
                $childErrors = $this->getErrorsForForm($child);
                if (!empty($childErrors)) {
                    $errors[$child->getName()] = $childErrors;
                }
            }
        }

        return $errors;
    }