PicoFeed\Filter\Tag::isAllowedTag PHP Метод

    public function isAllowedTag($tag)
    {
        return in_array($tag, array_merge($this->tag_whitelist, array_keys($this->config->getFilterWhitelistedTags(array()))));
    }

 /**
  * Parse closing tag.
  *
  * @param resource $parser XML parser
  * @param string   $tag    Tag name
  */
 public function endTag($parser, $tag)
 {
     if (!array_pop($this->empty_tags) && $this->tag->isAllowedTag($tag)) {
         $this->output .= $this->tag->closeHtmlTag($tag);
     }
 }