/**
* Add a MIME subpart.
*
* @param MIME_Part $mime_part Add a MIME_Part subpart to the current
* MIME_Part.
* @param string $index The index of the added MIME_Part.
*/
public function addPart($mime_part, $index = null)
{
/* Add the part to the parts list. */
if (is_null($index)) {
end($this->_parts);
$id = key($this->_parts) + 1;
$ptr =& $this->_parts;
} else {
$ptr =& $this->_partFind($index, $this->_parts, true);
if ($pos = strrpos($index, '.')) {
$id = substr($index, $pos + 1);
} else {
$id = $index;
}
}
/* Set the MIME ID if it has not already been set. */
if ($mime_part->getMIMEId() === null) {
$mime_part->setMIMEId($id);
}
/* Store the part now. */
$ptr[$id] = $mime_part;
/* Clear the ID -> Part mapping cache. */
$this->_idmap = array();
}
