根据首字母进行排序

public function getList($data,$user) {
    $list = appcommonmodelChinaArea::getCityList();
    $province =  appcommonmodelChinaArea::where("level",1)->cache(86400 * 7)->column("id,name");
    $result = [];
    foreach($list as &$val){   
       if($val["is_hot"]){
           $result["hot"][] = $val;
       }
       $val["province"] =  $province[$val['pid']];
          读取数据库所有的首字母排序 $result["city_list"][$val['first']][]   查询的数据库必须要有一个首字母

       $result["city_list"][$val['first']][] = $val;
    }
    return ApiReturn::r(1,$result);  
}