/**
* Returns the text content wrapped within a HTML comment with boundary
* identifier as its comment content.
* @return string text content chunck.
*/
public function flush()
{
$content = parent::flush();
if (empty($content)) {
return "";
}
return '<!--' . $this->getBoundary() . '-->' . $content . '<!--//' . $this->getBoundary() . '-->';
}