SimpleXML打印键值问题

Question

我已经在谷歌上搜索了一个多小时，很沮丧，这看起来很简单。我想要打印的只是我的 accountId。这是我从服务器返回的 xml：

SimpleXMLElement Object
(
[accounts] => SimpleXMLElement Object
    (
        [account] => SimpleXMLElement Object
            (
                [billingStreet] => SimpleXMLElement Object
                    (
                    )

                [billingCity] => SimpleXMLElement Object
                    (
                    )

                [billingState] => SimpleXMLElement Object
                    (
                    )

                [billingPostalCode] => SimpleXMLElement Object
                    (
                    )

                [billingCountry] => SimpleXMLElement Object
                    (
                    )

                [city] => Los Angeles
                [accountId] => XXXXX
                [companyName] => SimpleXMLElement Object
                    (
                    )

                [country] => United States
                [email] => XXXXX
                [enabled] => 1
                [fax] => SimpleXMLElement Object
                    (
                    )

                [firstName] => XXXXX
                [lastName] => XXXXX
                [multiClientFolder] => 0
                [multiUser] => 0
                [phone] => XXXXX
                [postalCode] => XXXXX
                [state] => CA
                [street] => XXXXX
                [title] => SimpleXMLElement Object
                    (
                    )

                [accountType] => 0
                [subscriberLimit] => 250000
            )

    )

[total] => 1
[limit] => 20
[offset] => 0
)

我想要的只是 accountId。我正在使用它，但它不打印任何内容：

$ch=curl_init("https://app.sandbox.icontact.com/icp/a/");
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
$buf = curl_exec($ch);
curl_close($ch);
$xml = simplexml_load_string($buf);
$aid=$xml->$accounts->$account->$accountId;
print($aid);

我可以使用 print_r 打印整个 xml 数组。我不确定我做错了什么

Answer 1

也许 $aid=$xml->accounts->account->accountId;？

Answer 2

如果有可能在响应中获取多个帐户，您可以向帐户元素添加一个数组索引：

$aid = $xml->accounts->account[0]->accountId;

或者迭代帐户：

foreach ($xml->accounts->account as $account) {
    ...
}

另请注意，$aid 的类型为 SimpleXMLElement。在大多数情况下，您可以按原样使用它，它将自动转换为适当的类型，但如果您希望该值作为字符串，则可以使用显式转换：

$aid = (string) $xml->accounts->account[0]->accountId;