问可以简化这段PHP代码以提高性能吗？

EN

  function getBrands($stores, $bl)
  {
    $html = "";

    //Loop through all the stores and get the brands
    foreach ($stores as $store)
    {
      //Get all associated brands for store
      $result = $bl->getBrandsByStore($store['id']);

      //Add all brands to array $brands[]
      while ($row = mysql_fetch_array($result))
      {
        //If this is the first run, we do not need to check if it already exists in array
        if(sizeof($brands) == 0)
        {
          $brands[] = array("id" => $row['id'], "name" => $row['name']);
        }
        else
        {
          // Check tosee if brand has already been added.
          if(!isValueInArray($brands, $row['id']))
            $brands[] = array("id" => $row['id'], "name" => $row['name']);
        }
      }
    }

    //Create the HTML output
    foreach($brands as $brand)
    {
      $url = get_bloginfo('url').'/search?brandID='.$brand['id'].'&brand='.urlSanitize($brand['name']);
      $html.= '<a href="'.$url.'" id="'.$brand['id'].'" target="_self">'.$brand['name'].'</a>, ';
    }

    return $html;
  }

  //Check to see if an ID already exists in the array
  function isValueInArray($values, $val2)
  {
    foreach($values as $val1)
    {
      if($val1['id'] == $val2)
        return true;
    }
    return false;
  }