public static function has($haystack, $needle, $delim = ',')
{
return tagged($haystack, $needle, $delim);
}
function filtered_tags($tags, $supported, $delim = ',')
{
$out = array();
$words = words($tags, $delim);
foreach ($words as $w) {
if (tagged($supported, $w)) {
$out[] = $w;
}
}
return implode($delim, $out);
}
