Core_Email::_remove_nl_callback

protected function _remove_nl_callback($matches)
{
    if (strpos($matches[1], "\r") !== false || strpos($matches[1], "\n") !== false)
    {
        $matches[1] = str_replace(array("\r\n", "\r", "\n"), '', $matches[1]);
    }

    return $matches[1];
}