Source::get_language(): string|null

450    public function get_language()451    {452        if ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_RSS_20, 'language')) {453            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);454        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_DC_11, 'language')) {455            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);456        } elseif ($return = $this->get_source_tags(\SimplePie\SimplePie::NAMESPACE_DC_10, 'language')) {457            return $this->sanitize($return[0]['data'], \SimplePie\SimplePie::CONSTRUCT_TEXT);458        } elseif (isset($this->data['xml_lang'])) {459            return $this->sanitize($this->data['xml_lang'], \SimplePie\SimplePie::CONSTRUCT_TEXT);460        }461 462        return null;463    }