购物车页Smart Payment Button中的PayPal账户支付按钮点击后的报错问题解决

系统升级到最新的2.17.1，fecro升到到最新的1.7.1，配置之后，在购物车页点击“PayPal Buy Now”按钮，弹窗打开后会瞬间关闭，异步请求中有报错。

1. 购物车页点击按钮

2. 异步请求中的报错 URL: http://xxx.com/payment/paypal/express/button

   "EC-0E965223CB5085024"
   An Error occurred while handling another error:
   yii\web\HeadersAlreadySentException: Headers already sent in xxxx\vendor\fancyecommerce\fecshop\app\appfront\modules\Payment\block\paypal\express\Start.php on line 34. in xxxx\vendor\yiisoft\yii2\web\Response.php:373
   Stack trace:
   #0 xxxx\vendor\yiisoft\yii2\web\Response.php(346): yii\web\Response->sendHeaders()
   #1 xxxx\vendor\yiisoft\yii2\web\ErrorHandler.php(136): yii\web\Response->send()
   #2 xxxx\vendor\yiisoft\yii2\base\ErrorHandler.php(135): yii\web\ErrorHandler->renderException(Object(yii\web\HeadersAlreadySentException))
   #3 [internal function]: yii\base\ErrorHandler->handleException(Object(yii\web\HeadersAlreadySentException))
   #4 {main}
   Previous exception:
   yii\web\HeadersAlreadySentException: Headers already sent in xxxx\vendor\fancyecommerce\fecshop\app\appfront\modules\Payment\block\paypal\express\Start.php on line 34. in xxxx\vendor\yiisoft\yii2\web\Response.php:373
   Stack trace:
   #0 xxxxx\vendor\yiisoft\yii2\web\Response.php(346): yii\web\Response->sendHeaders()
   #1 xxxxx\vendor\yiisoft\yii2\base\Application.php(398): yii\web\Response->send()
   #2 xxxx\appfront\web\index.php(66): yii\base\Application->run()
   #3 {main}
   

3. 修复方法 文件路径：vendor/fancyecommerce/fecshop/app/appfront/modules/Payment/block/paypal/express/Start.php

    public function startButtonPayment()
    {
        $methodName_ = 'SetExpressCheckout';
        $nvpStr_ = Yii::$service->payment->paypal->getExpressTokenNvpStr();
        //echo $nvpStr_;exit;
        $checkoutReturn = Yii::$service->payment->paypal->PPHttpPost5($methodName_, $nvpStr_);
        //var_dump($checkoutReturn);
        if (strtolower($checkoutReturn['ACK']) == 'success') {
            $token = $checkoutReturn['TOKEN'];
            if($token){
                if(!Yii::$service->order->generatePPExpressOrder($token)){
                    return false;
                }
                echo '"'.$token.'"';
            }
               
        } elseif (strtolower($checkoutReturn['ACK']) == 'failure') {
            echo $checkoutReturn['L_LONGMESSAGE0'];
        } else {
            var_dump($checkoutReturn);
        }
    }
   

   ===>

    public function startButtonPayment()
    {
        $methodName_ = 'SetExpressCheckout';
        $nvpStr_ = Yii::$service->payment->paypal->getExpressTokenNvpStr();
        //echo $nvpStr_;exit;
        $checkoutReturn = Yii::$service->payment->paypal->PPHttpPost5($methodName_, $nvpStr_);
        //var_dump($checkoutReturn);
        if (strtolower($checkoutReturn['ACK']) == 'success') {
            $token = $checkoutReturn['TOKEN'];
            if($token){
                if(!Yii::$service->order->generatePPExpressOrder($token)){
                    return false;
                }
                echo '"'.$token.'"';
            }
               
        } elseif (strtolower($checkoutReturn['ACK']) == 'failure') {
            echo $checkoutReturn['L_LONGMESSAGE0'];
        } else {
            var_dump($checkoutReturn);
        }
   	exit;
    }
   

   startButtonPayment函数最后添加exit;就正常了。

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