/**
* Callback function for updating href's with data-* attrbutes, after they've been identified with a regular expression
* @param $matches
* @return string
*/
private static function filter_callback($matches)
{
$data = Amber::lookup_url($matches[1]);
$result = $matches[0];
foreach ($data as $key => $value) {
$result .= " {$key}=\"{$value}\"";
}
return $result;
}
