code: static public function decode($number)
      {
          $k = self::$encoder;
          preg_match_all('/[1][a-zA-Z]|[2-9]|[a-zA-Z]|[0]/', $number, $a);
          $n = '';
          $o = count($k);
          foreach ($a[0] as $i) {
              $f = preg_match('/1([a-zA-Z])/', $i, $v);
              if ($f == true) {
                  $i = $o + array_search($v[1], $k);
              } else {
                  $i = array_search($i, $k);
              }
              $n .= $i;
          }
          return $n;
      }
docs: Decodes a string into an integer
  
  @param string $number string to decode into an integer
  
  @return int