Php foreach正在返回空

我对我正在执行的循环有点怀疑，因为它返回的是空值

首先，我收到的物品如下：

$items = Session::get('items');
$deco = json_decode($items, true);

如果我返回

$deco

，我会得到以下结果：

{
 "items":[
      {
        "id":1,
        "inventoryID":1,
        "title":"Product 1",
        "quantity":1,
        "unit_price":20,
        "image":"img.png"
      },

      {
        "id":2,
        "inventoryID":1,
        "title":"Product2",
        "quantity":1,
        "unit_price":25,
        "image":"img.png"
       }
    ]
}

现在，在循环中（我使用它来更改paypal集成的一些键的值），我有以下内容：

$results = [];
    foreach($deco['items'] as $element) {

        $name=$element['title'];
        $quantity=$element['quantity'];
        $sku= $element['id'];
        $price=$element['unit_price'];


        $item = new Item();
        $item -> setName($name)
        ->setCurrency('USD')
        ->setQuantity($quantity)
        ->setSku($sku) 
        ->setPrice($price);

        $results[]=$item;
    }  

如果我返回

return$item

（在循环之外），我只得到一个值，而不是所有集合：

{
"name": "Product2",
"currency": "USD",
"quantity": 1,
"sku": 2,
"price": "25"
}

但是，如果我返回所需的变量

return$results

，它会给我这个（它根据需要执行{}项，但返回空）：

整个代码看起来像：

public function test(){
    $items = Session::get('items');
    $deco = json_decode($items, true);
    $results = [];
    foreach($deco['items'] as $element) {

        $name=$element['title'];
        $quantity=$element['quantity'];
        $sku= $element['id'];
        $price=$element['unit_price'];


        $item = new Item();
        $item -> setName($name)
        ->setCurrency('USD')
        ->setQuantity($quantity)
        ->setSku($sku) 
        ->setPrice($price);

        $results[]=$item;
    }  
    return $results;
}

编辑：位于

\vendor\paypal\restapi sdk php\lib\paypal\api

的

Item.php

模型是默认的paypal：

class Item extends PayPalModel
{
/**
 * Stock keeping unit corresponding (SKU) to item.
 *
 * @param string $sku
 * 
 * @return $this
 */
public function setSku($sku)
{
    $this->sku = $sku;
    return $this;
}

/**
 * Stock keeping unit corresponding (SKU) to item.
 *
 * @return string
 */
public function getSku()
{
    return $this->sku;
}

/**
 * Item name. 127 characters max.
 *
 * @param string $name
 * 
 * @return $this
 */
public function setName($name)
{
    $this->name = $name;
    return $this;
}

/**
 * Item name. 127 characters max.
 *
 * @return string
 */
public function getName()
{
    return $this->name;
}

/**
 * Description of the item. Only supported when the `payment_method` is set to `paypal`.
 *
 * @param string $description
 * 
 * @return $this
 */
public function setDescription($description)
{
    $this->description = $description;
    return $this;
}

/**
 * Description of the item. Only supported when the `payment_method` is set to `paypal`.
 *
 * @return string
 */
public function getDescription()
{
    return $this->description;
}

/**
 * Number of a particular item. 10 characters max.
 *
 * @param string $quantity
 * 
 * @return $this
 */
public function setQuantity($quantity)
{
    $this->quantity = $quantity;
    return $this;
}

/**
 * Number of a particular item. 10 characters max.
 *
 * @return string
 */
public function getQuantity()
{
    return $this->quantity;
}

/**
 * Item cost. 10 characters max.
 *
 * @param string|double $price
 * 
 * @return $this
 */
public function setPrice($price)
{
    NumericValidator::validate($price, "Price");
    $price = FormatConverter::formatToPrice($price, $this->getCurrency());
    $this->price = $price;
    return $this;
}

/**
 * Item cost. 10 characters max.
 *
 * @return string
 */
public function getPrice()
{
    return $this->price;
}

/**
 * 3-letter [currency code](https://developer.paypal.com/docs/integration/direct/rest_api_payment_country_currency_support/).
 *
 * @param string $currency
 * 
 * @return $this
 */
public function setCurrency($currency)
{
    $this->currency = $currency;
    return $this;
}

/**
 * 3-letter [currency code](https://developer.paypal.com/docs/integration/direct/rest_api_payment_country_currency_support/).
 *
 * @return string
 */
public function getCurrency()
{
    return $this->currency;
}
//More similar stuff

---

提前感谢您

这仅仅是因为JMS序列化。 我猜在控制器级别，您可能需要检查是否应用了任何序列化组。

答案（感谢Ionica on discord的laravel社区）：

---

如果我返回$item（在循环之外）

@CaddyDZ，会让我觉得这里有一些

{

}

不匹配或发生了什么事情……我认为

item

是一个脏模型，没有保存，请在

$results[]之前尝试运行
dd（$item）
=$item

查看

$item

是否为空对象如何检查返回结果？在我看来，你在使用json_编码之类的东西。考虑使用VARYDUMP来检查返回结果。您可以同时发布模型类吗？是否在模型中隐藏了带有$hidden属性的字段？

class Item extends PayPalModel
{
/**
 * Stock keeping unit corresponding (SKU) to item.
 *
 * @param string $sku
 * 
 * @return $this
 */
public function setSku($sku)
{
    $this->sku = $sku;
    return $this;
}

/**
 * Stock keeping unit corresponding (SKU) to item.
 *
 * @return string
 */
public function getSku()
{
    return $this->sku;
}

/**
 * Item name. 127 characters max.
 *
 * @param string $name
 * 
 * @return $this
 */
public function setName($name)
{
    $this->name = $name;
    return $this;
}

/**
 * Item name. 127 characters max.
 *
 * @return string
 */
public function getName()
{
    return $this->name;
}

/**
 * Description of the item. Only supported when the `payment_method` is set to `paypal`.
 *
 * @param string $description
 * 
 * @return $this
 */
public function setDescription($description)
{
    $this->description = $description;
    return $this;
}

/**
 * Description of the item. Only supported when the `payment_method` is set to `paypal`.
 *
 * @return string
 */
public function getDescription()
{
    return $this->description;
}

/**
 * Number of a particular item. 10 characters max.
 *
 * @param string $quantity
 * 
 * @return $this
 */
public function setQuantity($quantity)
{
    $this->quantity = $quantity;
    return $this;
}

/**
 * Number of a particular item. 10 characters max.
 *
 * @return string
 */
public function getQuantity()
{
    return $this->quantity;
}

/**
 * Item cost. 10 characters max.
 *
 * @param string|double $price
 * 
 * @return $this
 */
public function setPrice($price)
{
    NumericValidator::validate($price, "Price");
    $price = FormatConverter::formatToPrice($price, $this->getCurrency());
    $this->price = $price;
    return $this;
}

/**
 * Item cost. 10 characters max.
 *
 * @return string
 */
public function getPrice()
{
    return $this->price;
}

/**
 * 3-letter [currency code](https://developer.paypal.com/docs/integration/direct/rest_api_payment_country_currency_support/).
 *
 * @param string $currency
 * 
 * @return $this
 */
public function setCurrency($currency)
{
    $this->currency = $currency;
    return $this;
}

/**
 * 3-letter [currency code](https://developer.paypal.com/docs/integration/direct/rest_api_payment_country_currency_support/).
 *
 * @return string
 */
public function getCurrency()
{
    return $this->currency;
}
//More similar stuff

    $items = Session::get('items');
    $deco = json_decode($items,true);
    $itemList = new ItemList();

foreach($deco['items'] as $element) {

    $item = new Item();
    $item->setName($element['title'])
        ->setCurrency('USD')
        ->setQuantity($element['quantity'])
        ->setSku($element['id']) 
        ->setPrice($element['unit_price']);

    $itemList->addItem($item);
}

$arr = $itemList->toArray();
return $arr;