Get values from a parsed XML Soap Message - php

Question

I'm trying to consume a C# WCF Webservice with PHP, and I'm currently facing a really big problem.
First, let me show you what one of the the WCF Webservice responses looks like :
<?xml version="1.0" encoding="UTF-8"?>
<s:envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:header>
<activityid xmlns="http://schemas.microsoft.com/2004/09/ServiceModel/Diagnostics" correlationid="6b8187a6-79a9-4bc4-a195-7c3b66547408">b340ad42-7be9-466c-a9f1-4048d35b7cb5</activityid>
</s:header>
<s:body>
<getalljobsresponse xmlns="http://tempuri.org/">
<getalljobsresult xmlns:a="http://schemas.datacontract.org/2004/07/Transcode.Webservice.Messages" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<a:jobinfo>
<a:associatedfilesize>34551192</a:associatedfilesize>
<a:associateduserid>10</a:associateduserid>
<a:jobcompletiondate>2016-06-09T10:37:42.2568136</a:jobcompletiondate>
<a:jobid>29</a:jobid>
<a:jobsubmissiondate>2016-06-09T10:37:27.8522463</a:jobsubmissiondate>
<a:remotefilepath>ftp://localhost/transcode_uploads/Luc/LinkinPark-DontStay.au</a:remotefilepath>
<a:taskprice>0.05</a:taskprice>
<a:taskstate>2</a:taskstate>
</a:jobinfo>
<a:jobinfo>
<a:associatedfilesize>34551192</a:associatedfilesize>
<a:associateduserid>10</a:associateduserid>
<a:jobcompletiondate>2016-06-09T11:46:07.7590635</a:jobcompletiondate>
<a:jobid>1029</a:jobid>
<a:jobsubmissiondate>2016-06-09T11:45:55.8115507</a:jobsubmissiondate>
<a:remotefilepath>ftp://localhost/transcode_uploads/Luc/LinkinPark-DontStay.au</a:remotefilepath>
<a:taskprice>0.05</a:taskprice>
<a:taskstate>2</a:taskstate>
</a:jobinfo>
</getalljobsresult>
</getalljobsresponse>
</s:body>
</s:envelope>
I'm trying everything to get a jobinfo element with all its attributes, but it doesn't seem to work well ...
I tried the following line of code :
$xml->getElementsByTagName('associatedfilesize')->item(0)->nodeValue
And it works on a single attribute, as for jobid or anything else !
The problem is, I would like to get a jobInfo objet in its entirety, by using something like :
$xml->getElementsByTagName('jobInfo')
Could you please help me guys, I have very little time left to finish my work and I'm stuck on that issue for too long...