json中的php变量

Question

我有这段用于 paypal 单次支付调用的代码，我想添加一个 php 变量，其中价格为“值”:".$planPrice."如果我输入任何数字而不是 $planPrice，例如:“1000”，它可以正常工作并且我收到通知，但是当我添加 php 变量时，它会这样说:

Fatal error: Uncaught exception 'InvalidArgumentException' with message 'Invalid JSON String' in C:\xampp\htdocs\website\paypal_payouts\PayPal-PHP-SDK\paypal\rest-api-sdk-php\lib\PayPal\Validation\JsonValidator.php:29 Stack trace: #0 C:\xampp\htdocs\website\paypal_payouts\PayPal-PHP-SDK\paypal\rest-api-sdk-php\lib\PayPal\Common\PayPalModel.php(50): PayPal\Validation\JsonValidator::validate('{\r\n ...') #1 C:\xampp\htdocs\website\paypal_payouts\CreateSinglePayout.php(67): PayPal\Common\PayPalModel->__construct('{\r\n ...') #2 C:\xampp\htdocs\website\admin\reports\paynow.php(19): include('C:\xampp\htdocs...') #3 {main} thrown in C:\xampp\htdocs\website\paypal_payouts\PayPal-PHP-SDK\paypal\rest-api-sdk-php\lib\PayPal\Validation\JsonValidator.php on line 29

这是php中的代码:

$senderItem = new \PayPal\Api\PayoutItem();
$senderItem->setRecipientType('Email')
    ->setNote('Thanks for your patronage!')
    ->setReceiver($coachUsername)
    ->setSenderItemId("2014031400023")
    ->setAmount(new \PayPal\Api\Currency("{
                        'value':".$planPrice.",
                        'currency':'USD'
                    }")); 

Answer 1

You don't need to pass a JSON string to Paypal\Api\Currency ，使用数组会更简单:

$senderItem = new \PayPal\Api\PayoutItem();
$senderItem->setRecipientType('Email')
    ->setNote('Thanks for your patronage!')
    ->setReceiver($coachUsername)
    ->setSenderItemId("2014031400023")
    ->setAmount(new \PayPal\Api\Currency([
                        'value' => $planPrice,
                        'currency' => 'USD'
                    ]));

但如果你必须使用 JSON，则它需要有效。 JSON 只允许对字符串和键名使用双引号:

$senderItem = new \PayPal\Api\PayoutItem();
$senderItem->setRecipientType('Email')
    ->setNote('Thanks for your patronage!')
    ->setReceiver($coachUsername)
    ->setSenderItemId("2014031400023")
    ->setAmount(new \PayPal\Api\Currency('{
                        "value":'.$planPrice.',
                        "currency":"USD"
                    }'));

(我在这里假设 "value" 应该设置为一个 JSON 数字。如果它应该是一个 JSON 字符串，请将倒数第三行替换为 "value": "' . $planPrice . '", 代替。)