function search_color не подсвечивает текст из цифр

# Format search highlight
function search_color($sourse, $word) {
	global $conf;
	$word = urldecode($word);
	if ($word) {
		if (strstr($word, " ")) {
			$warray = explode(" ", str_replace("  ", " ", $word));
		} else {
			$warray[] = $word;
		}
		preg_match_all("#<[^>]*>#", $sourse, $
                  tags);
		array_unique($
                  tags);
		$taglist = array();
		$k = 0;
		foreach($
                  tags[0] as $i) {
			$k++;
			$taglist[$k] = $i;
			$sourse = str_replace($i, "<".$k.">", $sourse);
		}
		foreach($warray as $i) if (!is_numeric($i)) $sourse=preg_replace("#".$i."#i", "<font style=\"background-color: #FFFF00; color: #FF0000;\">$0</font>", $sourse);
		foreach($taglist as $k => $i) $sourse = str_replace("<" . $k . ">", $i, $sourse);
	}
	return $sourse;
}