网站根目录extend/function.php文件内写入

if (!function_exists('diy_adv_total')){
   // 获取广告组内广告的数量
   function diy_adv_total($pid = 0)
   {
      $total = 0;
      $pid = intval($pid);
      if (!empty($pid)) {
         $where = [
            'pid'   => $pid,
            'status'  => 1,
            'is_del'  => 0,
            'lang'    => get_home_lang(),
          ];
          $total = \think\Db::name('ad')->where($where)->count();
       }
       echo intval($total);
   }
}