如何使用 DOMDocument 解析 xml 命名空间并确保获取对象

2022-01-10 00:00:00 xml xml-parsing php domdocument php-5.3

我正在尝试解析来自其他服务器的 xml 响应.

I'm trying to parse a xml response from other server.

我可以从那个 xml 中获取我需要的对象.但有些时候，有些如何，我不能得到一些对象.并出现此错误.

I can get my needed objects from that xml. but some times and some how, I cant get some objects. and this error appears.

致命错误:在第 91 行调用非对象上的成员函数 getElementsByTagName()

Fatal error: Call to a member function getElementsByTagName() on a non-object in line 91

我检查了每一件事，我认为没有错.

I checked every thing and I think there is nothing wrong.

这是一个示例 xml 响应:

here is an example xml response:

 <epp xmlns="urn:ietf:params:xml:ns:epp-1.0" xmlns:domain="http://epp.nic.ir/ns/domain-1.0">
<response xmlns:domain="http://epp.nic.ir/ns/domain-1.0">
    <result code="1000">
        <msg>Command completed successfully</msg>
    </result>
    <resData xmlns:domain="http://epp.nic.ir/ns/domain-1.0">
        <domain:infData xmlns:domain="http://epp.nic.ir/ns/domain-1.0">
            <domain:name>pooyaos.ir</domain:name>
                <domain:roid>305567</domain:roid>
                <domain:status s="serverHold"/>
                <domain:status s="irnicReserved"/>
                <domain:status s="serverRenewProhibited"/>
                <domain:status s="serverDeleteProhibited"/>
                <domain:status s="irnicRegistrationDocRequired"/>
                <domain:contact type="holder">pe59-irnic</domain:contact>
                <domain:contact type="admin">pe59-irnic</domain:contact>
.
.
and more...

我正在尝试获取此对象 domain:infData

and I am trying to get this object domain:infData

我认为错误来自这部分.

I think the error is from this part.

当我试图获取这个对象时，domdocument 返回 null.

when I am trying to get this object, domdocument returns null.

php代码:

function DinfData()
    {
        $data = $this->dom->getElementsByTagName("infData")->item(0);

91:     $name = $data->getElementsByTagName("name")->item(0)->nodeValue;
        $roid = $data->getElementsByTagName("roid")->item(0)->nodeValue;
        $update = $data->getElementsByTagName("upDate")->item(0)->nodeValue;
        $crdate = $data->getElementsByTagName("crDate")->item(0)->nodeValue;
        $exdate = $data->getElementsByTagName("exDate")->item(0)->nodeValue;

and more...

我将第 91 行标记为错误.

I marked line 91 in error.

谢谢....

$this->dom 是我的 DOMDocument 对象，没有错误.

$this->dom is my DOMDocument object and has no error.

如果没有问题，有没有更好的方法来获取元素?

If nothing is wrong is there any better way to get elements?

推荐答案

你需要使用 DOMDocument::getElementsByTagNameNS() 用于命名空间元素.找到 domain 指向的命名空间并将其与目标标记名称一起传递给方法，例如roid 或 name.

You need to use DOMDocument::getElementsByTagNameNS() which is for use with namespaced elements. Find the namespace that domain points to and pass it to the method along with the target tag name e.g. roid or name.

键盘演示

$dom = new DOMDocument();
$dom->loadXML($xml);

$ns = 'http://epp.nic.ir/ns/domain-1.0';

$data = $dom->getElementsByTagNameNS($ns, 'infData')->item(0);

$roid = $data->getElementsByTagNameNS($ns, 'roid')->item(0)->nodeValue;
$name = $data->getElementsByTagNameNS($ns, 'name')->item(0)->nodeValue;
// repeat the same for others

echo $roid . "
";
echo $name;

输出

305567
pooyaos.ir

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