/**
* Build OPML feed
*
* @access public
* @param string $filename
* @return string
*/
public function build($filename = '')
{
$this->document = new DomDocument('1.0', 'UTF-8');
$this->document->formatOutput = true;
$opmlElement = $this->document->createElement('opml');
$opmlElement->setAttribute('version', '1.0');
$headElement = $this->document->createElement('head');
if ($this->subscriptionList->getTitle() !== '') {
$titleElement = $this->document->createElement('title');
$titleElement->appendChild($this->document->createTextNode($this->subscriptionList->getTitle()));
$headElement->appendChild($titleElement);
}
$opmlElement->appendChild($headElement);
$opmlElement->appendChild($this->buildBody());
$this->document->appendChild($opmlElement);
if ($filename !== '') {
$this->document->save($filename);
return '';
}
return $this->document->saveXML();
}
