uniapp调用支付宝app支付崩溃问题

1.问题描述

我司前端使用uniapp的云打包，在某一次打包之后，线上环境当前端唤起支付时，app就直接闪退，崩溃。

2.php后端代码

        import('Vendor.alipay.AopClient', '', '.php');
        $bank = M('Banks')->where(['id' => self::BANK_ALI])->find();
        $parameter            = $this->formAppData($order);
        $apply['app_id']      = $bank['app_id'];
        $apply['method']      = 'alipay.trade.app.pay';
        $apply['charset']     = 'utf-8';
        $apply['sign_type']   = 'RSA2';
        $apply['timestamp']   = date('Y-m-d H:i:s');
        $apply['version']     = 1.0;
        $apply['notify_url']  = get_ali_app_notify();
        $apply['biz_content'] = $parameter;

        $aop                     = new \AopClient();
        $aop->rsaPrivateKey      = trim(file_get_contents($bank['ali_rsa_private_key']));
        $aop->alipayrsaPublicKey = trim(file_get_contents($bank['ali_rsa_public_key']));
        $paramStr = $aop->getSignContent($apply);
        $sign = $aop->alonersaSign($paramStr, $aop->rsaPrivateKey, 'RSA2'); //生成签名
        $apply['sign'] = $sign;
        $str = $aop->getSignContentUrlencode($apply);       //最终请求参数

        return $str;
-----------------------------------------------------------------------------------
        public function formAppData($order){
        $arr['subject']             = $this->getSubject();
        $arr['out_trade_no']        = $order['order_id'];
        $arr['total_amount']        = $order['all_money'];
        $arr['product_code']        = 'QUICK_MSECURITY_PAY';
        $arr['enable_pay_channels'] = "balance,moneyFund,debitCardExpress";
        return json_encode($arr);
    }

3.解决方案

$arr['out_trade_no']        = strval($order['order_id']）;
看了支付宝文章发现改字段必须要string类型，至于我们之前一直可以支付可能是前段打包的sdk更新了，新的sdk严格了这个类型，否则直接报错

（php弱类型语言，大家都容易去忽略变量的类型）