Valitron\Validator::checkAndSetLabel PHP Method

    protected function checkAndSetLabel($field, $msg, $params)
    {
        if (isset($this->_labels[$field])) {
            $msg = str_replace('{field}', $this->_labels[$field], $msg);
            if (is_array($params)) {
                $i = 1;
                foreach ($params as $k => $v) {
                    $tag = '{field' . $i . '}';
                    $label = isset($params[$k]) && (is_numeric($params[$k]) || is_string($params[$k])) && isset($this->_labels[$params[$k]]) ? $this->_labels[$params[$k]] : $tag;
                    $msg = str_replace($tag, $label, $msg);
                    $i++;
                }
            }
        } else {
            $msg = str_replace('{field}', ucwords(str_replace('_', ' ', $field)), $msg);
        }
        return $msg;
    }