/**
* prepare the tags and protected tags array
*/
private static function prepareTags($tags, $include_closing_tags = true)
{
if (!is_array($tags)) {
$tags = array($tags);
}
$hash = md5('prepareTags_' . json_encode($tags) . '_' . $include_closing_tags);
if (NNCache::has($hash)) {
return NNCache::get($hash);
}
foreach ($tags as $i => $tag) {
if (!NNText::is_alphanumeric($tag['0'])) {
continue;
}
$tags[$i] = '{' . $tag;
if ($include_closing_tags) {
$tags[] = '{/' . $tag;
}
}
return NNCache::set($hash, array($tags, self::protectArray($tags, 1)));
}