php Get the Example of id for Taobao classification

$url = "http://list.taobao.com/browse/cat-0.htm";
  $html = file_get_contents($url);
  echo '<meta charset="UTF-8">';
  $pattern='/\<a\s+href\=\"http\:\/\/list\.taobao\.com\/itemlist\/.*?\&cat\=([0-9]+)\"\s+target\=\"\_blank\"\>(.*?)\<\/a\>/';
  preg_match_all($pattern, $html, $array, PREG_SET_ORDER);
  foreach($array as $item) {
   echo $item[1] . "=>" . mb_convert_encoding($item[2], 'UTF-8', 'GB2312');
   echo "<br />";
  }