crm/app/model/Wechat.php

<?php

namespace app\model;

use think\Model;

class Wechat extends Model
{
    /**
     * 获取accesstoken
     */
    public function getAccesstokenAttr($value, $data)
    {
        if ($data['expire'] > time()) {
            return $data['accesstoken'];
        } else {
            $accessToken = getAccessToken($data['appid'], $data['secret']);
            self::update([
                'accesstoken' => $accessToken,
                'expire' => time() + 7100
            ], ['id' => $data['id']]);

            return $accessToken;
        }
    }
}