Php 在SimpleXmlElement上使用xPath获得单字符串结果

我正试图从谷歌的结账回复中获取一些数据。我使用SimpleXmlElement和xpath来搜索数据。其中一个问题是xpath的响应是一个SimpleXmlElements数组——我只需要字符串数据。另一个是响应可能包含标记名的多个LPE实例-例如，

至少显示两次，但我只想要一个结果

这是我到目前为止所拥有的

            $notifyData = array();
            $notifyData['buyerEmail'] = $data->xpath('buyer-billing-address//email')[0];
            $notifyData['buyerName'] = $data->xpath('buyer-billing-address//contact-name');
            $notifyData['transactionId'] = $data->xpath('/new-order-notification/google-order-number');
            $notifyData['itemName'] = $data->xpath('//item-name');
            $notifyData['amount'] = $data->xpath('//unit-price');
            $notifyData['currency'] = $notifyData['amount'][0]['currency'];//$data->xpath('//@currency[1]');

下面是print_r（）对$notifyData的响应

Array
(
    [buyerEmail] => Array
        (
            [0] => SimpleXMLElement Object
                (
                    [0] => sandbox@mysite.com
                )

        )

    [buyerName] => Array
        (
            [0] => SimpleXMLElement Object
                (
                    [0] => Mr Sandbox Buyer
                )

        )

    [transactionId] => Array
        (
            [0] => SimpleXMLElement Object
                (
                    [0] => 271578474675716
                )

        )

    [itemName] => Array
        (
            [0] => SimpleXMLElement Object
                (
                    [0] => My Item
                )

        )

    [amount] => Array
        (
            [0] => SimpleXMLElement Object
                (
                    [@attributes] => Array
                        (
                            [currency] => USD
                        )

                    [0] => 3.99
                )

        )

    [currency] => SimpleXMLElement Object
        (
            [0] => USD
        )

)

我想让数据在打印后显示为这样

下面是一个xml响应的示例

<new-order-notification xmlns="http://checkout.google.com/schema/2" serial-number="654578974677716-00001-7">

  <buyer-billing-address>

    <address1>19 sandbox st</address1>

    <address2></address2>

    <phone></phone>

    <email>sandbox@mysite.com</email>

    <company-name></company-name>

    <contact-name>Mr Sandbox Buyer</contact-name>

    <fax></fax>

    <country-code>AU</country-code>

    <city>Buyers Town</city>

    <region>VIC</region>

    <postal-code>3460</postal-code>

  </buyer-billing-address>

  <timestamp>2010-10-24T04:25:41.723Z</timestamp>

  <google-order-number>298578974677716</google-order-number>

  <shopping-cart>

    <items>

      <item>

        <digital-content>

          <key is-encrypted="true">PWWoqHo+FtfTi5vHmquOFTFNb4DwNjInAxkW89PLxtU=</key>

          <description>Follow the instructions</description>

          <url>http://mysite.com</url>

        </digital-content>

        <item-name>my product</item-name>

        <item-description>my product</item-description>

        <unit-price currency="USD">3.99</unit-price>

        <quantity>1</quantity>

      </item>

    </items>

  </shopping-cart>

  <order-adjustment>

    <merchant-codes />

    <total-tax currency="USD">0.0</total-tax>

    <adjustment-total currency="USD">0.0</adjustment-total>

  </order-adjustment>

  <buyer-id>634168749882822</buyer-id>

  <buyer-marketing-preferences>

    <email-allowed>true</email-allowed>

  </buyer-marketing-preferences>

  <buyer-shipping-address>

    <address1>19 sandbox st</address1>

    <address2></address2>

    <phone></phone>

    <email>sandbox@mysite.com</email>

    <company-name></company-name>

    <contact-name>Mr Sandbox Buyer</contact-name>

    <fax></fax>

    <country-code>AU</country-code>

    <city>Buyers Town</city>

    <region>VIC</region>

    <postal-code>3460</postal-code>

  </buyer-shipping-address>

  <order-total currency="USD">3.99</order-total>

  <fulfillment-order-state>NEW</fulfillment-order-state>

  <financial-order-state>REVIEWING</financial-order-state>

</new-order-notification>

沙盒街19号
sandbox@mysite.com
沙盒买家先生
金
买家镇
维克
3460
2010-10-24T04:25:41.723Z
298578974677716
PWWoqHo+FtfTi5vHmquOFTFNb4DwNjInAxkW89PLxtU=
按照说明去做
http://mysite.com
我的产品
我的产品
3.99
1.
0
0
634168749882822
真的
沙盒街19号
sandbox@mysite.com
沙盒买家先生
金
买家镇
维克
3460
3.99
新的
回顾

使用类型转换：

---

$notifyData['buyerName']=（字符串）$data->xpath（'buyer-billing-address//contact-name'）

这里不一定需要xpath。例如

$notifyData = array(
  'buyerEmail' => (string)$data->{'buyer-billing-address'}->email[0],
  'buyerName' => (string)$data->{'buyer-billing-address'}->{'contact-name'}[0],
  'transactionId' => (string)$data->{'google-order-number'}[0]
);
var_dump($notifyData);


function getData() {
  return <<< eox
<new-order-notification xmlns="http://checkout.google.com/schema/2" serial-number="654578974677716-00001-7">
...
</new-order-notification>
eox;
}

而且，通过via，您还可以处理多个元素，例如

$notifyData = array(
  'buyerEmail' => (string)$data->{'buyer-billing-address'}->email[0],
  'buyerName' => (string)$data->{'buyer-billing-address'}->{'contact-name'}[0],
  'transactionId' => (string)$data->{'google-order-number'}[0]
);
var_dump($notifyData);


function getData() {
  return <<< eox
<new-order-notification xmlns="http://checkout.google.com/schema/2" serial-number="654578974677716-00001-7">
...
</new-order-notification>
eox;
}

array(3) {
  ["buyerEmail"]=>
  string(18) "sandbox@mysite.com"
  ["buyerName"]=>
  string(16) "Mr Sandbox Buyer"
  ["transactionId"]=>
  string(15) "298578974677716"
}