Question

This is encoded: \u00d6
This is decoded: Ö

What function I have to use to decode that string into something readable?

\u00d6asdf -> Öasdf

Answer 1

Normally this would be the urldecode method, but it does not apply to unicode characters, like yours. Try this one instead:

function unicode_urldecode($url)
{
   preg_match_all('/%u([[:alnum:]]{4})/', $url, $a);

   foreach ($a[1] as $uniord)
   {
       $utf = '&#x' . $uniord . ';';
       $url = str_replace('%u'.$uniord, $utf, $url);
   }

   return urldecode($url);
}