Question

我正在记录API调用的错误请求/响应。为了将日志存储在数据库中，我想用*的替换信用卡号。

请求XML如下所示：

<xml>
    <request servicekey="service key" branchcode="branch" language="EN" postalcode="Postal Code" country="CA" email="email@example.com">
        <paxes>
            <pax id="1" birthdate="19790215" firstname="John" lastname="Smith" />
            <pax id="2" birthdate="19800828" firstname="Jane" lastname="Smith" />
        </paxes>
        <plans>
            <plan code="Plan Code" >
                <paxes>
                    <pax id="1" sumins="1200.00" />
                    <pax id="2" sumins="1480.31" />
                </paxes>
            </plan>
        </plans>
        <payments>
            <payment amount="246.24" type="VI" ccnum="4111111111111111" ccexp="0711" ccname="John Smith" />
        </payments>
    </request>
</xml>

从这里我只需抓住付款节点和ccnum属性进行编辑（xml保存为$ requestXML）：

$_req = new DOMDocument();
$_req->loadXML($requestXML);
$_xpathReq = new DOMXPath($_req);
$_reqDom = $_xpathReq->query("/xml/request/payments/payment");
$_reqDom->item(0)->setAttribute('ccnum','*****');
$requestXML = $_req->saveXML();

按预期工作，xml中的CC号替换为*'s

$ responseXML有点不同：

<string xmlns="http://tempuri.org/">
    <xml>
        <request servicekey="service key" branchcode="branch code" language="EN" postalcode="Postal Code" country="CA" email="email@example.com">
            <paxes>
                <pax id="1" birthdate="19790215" firstname="John" lastname="Smith" />
                <pax id="2" birthdate="19800828" firstname="Jane" lastname="Smith" />
            </paxes>
            <plans>
                <plan code="Plan Code">
                    <paxes>
                        <pax id="1" sumins="1200.00" />
                        <pax id="2" sumins="1480.31" />
                    </paxes>
                </plan>
            </plans>
            <payments>
                <payment amount="246.24" type="VI" ccnum="4111111111111111" ccexp="0711" ccname="John Smith" />
            </payments>
        </request>
        <response>
            <errors>
                <error>Purchase Card Processing was not approved [-1]:Cancelled: null | CARD: **** | Exp: 1407 | Amount: $246.24</error>
            </errors>
        </response>
    </xml>
</string>

和以前一样，我运行了一段非常相似的PHP代码：

$_req = new DOMDocument();
    $_req->loadXML($responseXML);
    $_xpathReq = new DOMXPath($_req);
    $_reqDom = $_xpathReq->query("/string/xml/request/payments/payment");
    $_reqDom->item(0)->setAttribute('ccnum','*****');
    $responseXML = $_req->saveXML();

但是，当我执行此操作时，我会Fatal error: Call to a member function setAttribute() on a non-object指向包含$_reqDom->item(0)->setAttribute('ccnum','*****');

的行

2 xml之间的唯一区别是一个包含在字符串节点中，并且有一个额外的节点表示响应。我想我可以做一个解决方法（只需拔出响应节点并将其附加到请求xml），但我现在正处于这样一种工作方式，这是我的使命。

Answer 1

问题是因为响应xml中的命名空间。您必须使用XPath选择器注册rootNamespace。以下代码将起作用：

$response = new DOMDocument();
$response->loadXML($responseXml);
$selector = new DOMXPath($response);

// get the root namespace
$rootNamespace = $response->lookupNamespaceUri(
    $response->namespaceURI
);
// and register it with $selector. I'm using 'x' as the prefix
// you are free to use a different prefix
$selector->registerNamespace('x', $rootNamespace);

// You won't need to specify the whole path. You could just grab 
// all payment node regardless of their location in the xml tree
$result = $selector->query('//x:payment');
foreach($result as $node) {
    $node->setAttribute('ccnum', '*****');
}

$responseXml = $response->saveXML();
echo $responseXml;

Answer 2

<string>标记包含命名空间，您需要使用DOMXPath注册该命名空间。

$_req = new DOMDocument();
$_req->loadXML($responseXML);
$_xpathReq = new DOMXPath($_req);

$_xmlns = $_req->lookupNamespaceUri(NULL); 
$_xpathReq->registerNamespace('x', $_xmlns); 

$_reqDom = $_xpathReq->query("//x:xml/x:request/x:payments/x:payment");
$_reqDom->item(0)->setAttribute('ccnum','*****');
$responseXML = $_req->saveXML();

Answer 3

我遇到了类似的问题，其中xml有几个名称空间定义如下：

<?xml version="1.0" encoding="UTF-8"?>
  <feed xmlns="http://www.w3.org/2005/Atom" 
        xmlns:dc="http://purl.org/dc/elements/1.1/" 
        xmlns:dcterms="http://purl.org/dc/terms/" 
        xmlns:media="http://search.yahoo.com/mrss/" 
        xmlns:xhtml="http://www.w3.org/1999/xhtml">

这使得无法进行DOMXPath次查询。

通过以下方式导入xml来修复：

libxml_use_internal_errors(true);
$doc->loadHTML($rawXml, LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD | LIBXML_NSCLEAN);
libxml_use_internal_errors(false);

我希望这有助于某人。用这个把我的头发拉了下来......

Xpath setAttribute致命错误调用成员函数setAttribute

3 个答案: