php - fatal error : Cannot use object of type as array

Question

所以，当我尝试从对象单例获取数组列表时出现此错误。

这是 CardType.php 上的单例

class CardTypeAPIAccessor extends GuzzleClient
{

    private $client;

    public function __construct($client) 
    {
        if($client instanceof GuzzleClient)
        {
            $this->client = $client;
        }
        else
        {
            $this->client = parent::getClient();
        }
    }

    public function getCardTypes() {
        $cardTypes = array();

        try 
        {

            $response = $this->client->get('admin/card/type',
                ['headers' => ['Authorization' => $_SESSION['login']['apiKey']]
            ]);

            $statusCode = $response->getStatusCode();
            // Check that the request is successful.
            if ($statusCode == 200) 
            {
                $error = $response->json();
                foreach ($error['types'] as $type) 
                {
                    $cardType = new CardType();
                    $cardType->setCardTypeId($type['card_type_id']);
                    $cardType->setCategory($type['category']);

                    array_push($cardTypes, $cardType);
                }
            }
        }
        catch(RequestException $e) 
        {
            //todo
            echo $e->getRequest() . "</br>";
            if ($e->hasResponse()) 
            {
                echo $e->getResponse() . "</br>";
            }
        }
        return $cardTypes;      
    }
}

这是card_type.php 上的代码

<?php
     $cardTypes = $cardTypeAPIAccessor->getCardTypes();
     foreach ($cardTypes as $cardType){
     $Type = new CardType();
?>
     <tr>
        <!-- The error is here-->
        <td class="numeric"><?php echo $Type->getCardTypeId($cardType['card_type_id']); ?></td>
        <td class="numeric"><?php echo $Type->getCategory($cardType['category']); ?></td>
     </tr>

错误提示:无法将 CardType 类型的对象用作数组

我的代码有问题吗？

谢谢

Answer 1

看起来您已经获得了此行所需的所有值:

$cardTypes = $cardTypeAPIAccessor->getCardTypes();

所以在我看来，在你的循环中，你只需要:

foreach ($cardTypes as $cardType){
?>
 <tr>
    <td class="numeric"><?php echo $cardType->getCardTypeId(); ?></td>
    <td class="numeric"><?php echo $cardType->getCategory(); ?></td>
 </tr>

尽管这实际上只是基于给定代码和缺少的 CardType 类的猜测。但我认为不需要在循环内生成新对象。