/**
  * get_artist_info
  * Returns artist information
  */
 public static function get_artist_info($artist_id, $fullname = '')
 {
     $artist = null;
     if ($artist_id) {
         $artist = new Artist($artist_id);
         $artist->format();
         $fullname = $artist->f_full_name;
         // Data newer than 6 months, use it
         if ($artist->last_update + 15768000 > time()) {
             $results = array();
             $results['summary'] = $artist->summary;
             $results['placeformed'] = $artist->placeformed;
             $results['yearformed'] = $artist->yearformed;
             $results['largephoto'] = Art::url($artist->id, 'artist');
             $results['megaphoto'] = $results['largephoto'];
             return $results;
         }
     }
     $query = 'artist=' . rawurlencode($fullname);
     $xml = self::get_lastfm_results('artist.getinfo', $query);
     $results = array();
     $results['summary'] = strip_tags(preg_replace("#<a href=([^<]*)Last\\.fm</a>.#", "", (string) $xml->artist->bio->summary));
     $results['placeformed'] = (string) $xml->artist->bio->placeformed;
     $results['yearformed'] = (string) $xml->artist->bio->yearformed;
     $results['largephoto'] = $xml->artist->image[2];
     $results['megaphoto'] = $xml->artist->image[4];
     if ($artist) {
         if (!empty($results['summary']) || !empty($results['megaphoto'])) {
             $artist->update_artist_info($results['summary'], $results['placeformed'], $results['yearformed']);
             $image = Art::get_from_source(array('url' => $results['megaphoto']), 'artist');
             $rurl = pathinfo($results['megaphoto']);
             $mime = 'image/' . $rurl['extension'];
             $art = new Art($artist->id, 'artist');
             $art->reset();
             $art->insert($image, $mime);
             $results['largephoto'] = Art::url($artist->id, 'artist');
             $results['megaphoto'] = $results['largephoto'];
         }
     }
     return $results;
 }