protected function getBoundary($boundary, $charSet, $contentType, $encoding)
{
$result = '';
if ('' == $charSet) {
$charSet = $this->CharSet;
}
if ('' == $contentType) {
$contentType = $this->ContentType;
}
if ('' == $encoding) {
$encoding = $this->Encoding;
}
$result .= $this->textLine('--' . $boundary);
$result .= sprintf('Content-Type: %s; charset=%s', $contentType, $charSet);
$result .= $this->LE;
// RFC1341 part 5 says 7bit is assumed if not specified
if ('7bit' != $encoding) {
$result .= $this->headerLine('Content-Transfer-Encoding', $encoding);
}
$result .= $this->LE;
return $result;
}