Question

我有一个像这样的xml，如下所述。我试图使用以下表达式获得Cardnumber的值。

XPATH：

paymentService/ns0:submit/ns0:order/ns0:paymentDetails/ns0:VISA-SSL/cardNumber

但它给了我错误。任何人都能指导我吗？

<?xml version="1.0" encoding="UTF-8"?>
<paymentService version="1.0">
    <ns0:submit xmlns:ns0="http://www.tibco.com/ns/no_namespace_schema_location/Payment/PaymentProcessors/WorldPay_CC/SharedResources/Schemas/paymentService_v1.dtd">
        <ns0:order>
            <description>description</description>
            <amount value="500" currencyCode="EUR" exponent="2"/>
            <ns0:paymentDetails>
                <ns0:VISA-SSL>
                    <cardNumber>00009875083428500</cardNumber>
                    <expiryDate>
                        <date month="02" year="2008"/>
                    </expiryDate>
                    <cardHolderName>test</cardHolderName>
                </ns0:VISA-SSL>
                <session shopperIPAddress="192.165.22.35" id=""/>
            </ns0:paymentDetails>
            <shopper>
                <browser>
                    <acceptHeader>text/html</acceptHeader>
                    <userAgentHeader>mozilla 5.0</userAgentHeader>
                </browser>
            </shopper>
        </ns0:order>
    </ns0:submit>
</paymentService>

由于

Answer 1

问题是节点

<paymentService version="1.0">

由于未结束，您必须对其进行评论或正确结束。如果你评论试试这个XPATH

/ns0:submit/ns0:order/ns0:paymentDetails/ns0:VISA-SSL/cardNumber

Answer 2

您的xmlns:ns0放错了位置，并且（想到这种方式）因为ns0在 <ns0:submit>标记之后定义为，ns0:submit是“未定义”，因而是解析错误。

修改：

如果需要在PHP中使用此XPath，则必须在使用前声明命名空间：

<?xml version="1.0" encoding="UTF-8"?> <paymentService version="1.0" xmlns:ns0="http://www.tibco.com/ns/no_namespace_schema_location/Payment/PaymentProcessors/WorldPay_CC/SharedResources/Schemas/paymentService_v1.dtd"> <ns0:submit>

或者在评估XPath之前注册命名空间（感谢@MiMo指出）：

$xml->registerXPathNamespace("ns0","http://www.tibco.com/ns/no_namespace_schema_location/Payment/PaymentProcessors/WorldPay_CC/SharedResources/Schemas/paymentService_v1.dtd");

在XPATH之前添加斜杠：

/paymentService/ns0:submit/ns0:order/ns0:paymentDetails/ns0:VISA-SSL/cardNumber

Live demo with declaration first或Live demo with namespace registration（两者都在PHP中演示）。

Answer 3

您需要在评估XPath之前注册命名空间：

$xml->registerXPathNamespace('ns0', 'http://www.tibco.com/ns/no_namespace_schema_location/Payment/PaymentProcessors/WorldPay_CC/SharedResources/Schemas/paymentService_v1.dtd');

其中$xml是包含XML的SimpleXMLElement变量。

根据Passerby的回答，您的XPath需要以/开头：

/paymentService/ns0:submit/ns0:order/ns0:paymentDetails/ns0:VISA-SSL/cardNumber

XPATH错误：无法计算表达式

3 个答案: