How to parse xml namespaces with DOMDocument and be sure to get objects

Question

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

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

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

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

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...

and I am trying to get this object domain:infData

I think the error is from this part.

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

php code:

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...

I marked line 91 in error.

thanks ....

edit

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

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

Answer 1

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.

Codepad Demo

$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 . "\n";
echo $name;

Outputs

305567
pooyaos.ir

Answer 2

Simply put in your url into simple_load_file()

<?php
$xml = simplexml_load_file($xmlfile);
print $xml->infData;   // Sample content
?> 

This is a easiest method

Answer 3

But infData is not your tagName. This XML uses namespaces (domain is your namespace). Don't have experience with that so I really can help you any futher then the hint where to look. The getElementsByTagName is not going to work, you need something like DOMXPath I think that's where you can do something with namespaces.

Sorry I can't be of futher help but since no one mentioned the namespaces I thought I would just add the answer anyway. Maybe it will help you Google for an answer.