PHP代码优化：获取单个ID并下载图片

/** download */ if ($action == 'down') { $pagesize = 3; $curpage = $curpage + 1;

 $where = "web_status=3";
 if ($type == 'part') {
     $where .= " AND web_pic=''";
 }

 $id = isset($_GET['id']) ? intval($_GET['id']) : 0; // 获取输入的id
 
 if ($id > 0) {
     $where .= " AND web_id=$id"; // 根据输入的id筛选记录
 }

 $websites = $DB->fetch_all("SELECT web_id, web_name, web_url FROM $table WHERE $where ORDER BY web_id DESC LIMIT $start, $pagesize");
 $totalnum = $DB->get_count($table, $where);
 $totalpage = ceil($totalnum / $pagesize);

 echo '<div style="font-size: 12px; line-height: 25px; padding: 10px;">';
 if ($curpage <= $totalpage) {
     $savepath = '../' . $options['upload_dir'] . '/website/';

     echo '<meta http-equiv="refresh" content=3;url="' . $fileurl . '?act=' . $action . '&type=' . $type . '&page=' . $curpage . '">';
     echo '<h3>共需采集 ' . $totalpage . ' 页，每次下载 ' . $pagesize . ' 张，当前第 ' . $curpage . ' 页，正在下载远程图片...</h3>';
     foreach ($websites as $row) {
         $filepath = save_to_local(str_replace('/', '.', $row['web_url']), $savepath);
         $filesize = filesize($filepath);

         if ($filesize < 10240) {
             $newpath = str_replace('../image/', '', $filepath);
             if (!empty($newpath)) {
                 $status = '下载成功！';
                 $DB->update($table, array('web_pic' => $newpath), array('web_id' => $row['web_id']));
             } else {
                 $status = '下载失败！';
             }
         } else {
             $status = '文件大小超过限制！';
         }
         echo $row['web_id'] . ' - ' . $row['web_name'] . ' ------ ' . $status . '<br />';
     }
     echo '<h3>本页已采集完成，5秒后将自动采集下一页...</h3>';
 } else {
     echo '<h3>已经将所有的远程图片本地化!</h3>';    
 }
 echo '</div>';

}