Symfony 2: Retrieves every error message for the form to a simple array. Including the field error messages.

getErrorMessages.php

<?php

    private function getErrorMessages(\Symfony\Component\Form\Form $form) {
        $errors = array();
        foreach ($form->getErrors() as $key => $error) {
            $errors[] = $error->getMessage();
        }
        if ($form->hasChildren()) {
            foreach ($form->getChildren() as $child) {
                if (!$child->isValid()) {
                    $errors = array_merge($errors, $this->getErrorMessages($child));
                }
            }
        }
        return $errors;
    }