public static function getKeyWords(string $text, int $maxLen = 60): string
	{
		$keyWords = [];
		// nalezeni vsech linku v textu
		preg_match_all('/<a[^>]*>[^<]+<\/a>/i', $text, $found);
		if (isset($found[0])) {
			foreach ($found[0] as $kw) {
				$keyWords[] = self::lower(self::trim(strip_tags($kw)));
			}
		}

		// h2 a strong
		preg_match_all('/<(h2|strong)[^>]*>[^<]+<\/(h2|strong)>/i', $text, $found);
		if (isset($found[0])) {
			foreach ($found[0] as $kw) {
				$keyWords[] = self::lower(self::trim(strip_tags($kw)));
			}
		}

		$result = implode(', ', array_unique($keyWords));

		return self::truncate($result, $maxLen, '');
	}