yuanshan_zuche/application/index/controller/Plantask.php

<?php

namespace app\index\controller;

use think\Controller;
use think\Db;

class Plantask extends Controller
{

    //每辆车的价格日历里的今天价格 更新到 car 表里 pricetoday,如果价格日历里没有今天价格，就用 price 字段 放到 pricetoday 代替
    public function auto_car_pricejson_to_todayprice(){
        $todaydate = date('Y-m-d');
        $today = strtotime(date('Y-m-d'));

        $car_list = Db::name('car')->field('id,price,price_json')->where('pricedate','neq',$today)->order('id asc')->limit(50)->select();
        foreach($car_list as $key => $val){
            $update = ['pricedate'=>$today];

            if(!empty($val['price_json'])){
                $price_json = json_decode($val['price_json'],true);
                if(is_array($price_json) && isset($price_json[$todaydate])){
                    $update['pricetoday'] = $price_json[$todaydate];
                }
            }

            $update['pricetoday'] = $val['price'];
            Db::name('car')->where('id',$val['id'])->update($update);
        }
    }

}