Trouble Parsing SOAP response in PHP using simplexml - php

Question

I'm using cURL to POST a SOAP request. The response is as follows:
<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/">
<env:Header xmlns:wsa="http://www.w3.org/2005/08/addressing">
<wsa:To>http://www.w3.org/2005/08/addressing/anonymous</wsa:To>
<wsa:Action>http://www.csapi.org/schema/parlayx/common/v3_1/TerminalLocationPort/getLocationForGroupResponse</wsa:Action>
</env:Header>
<env:Body>
<ns2:getLocationForGroupResponse xmlns:ns2="http://www.csapi.org/schema/parlayx/terminal_location/v3_1/local">
<ns2:result>
<address>234983</address>
<reportStatus>Retrieved</reportStatus>
<currentLocation>
<latitude>12.5665</latitude>
<longitude>43.7708</longitude>
<timestamp>2012-01-03T17:06:16.805+01:30</timestamp>
</currentLocation>
</ns2:result>
<ns2:result>
<address>423903</address>
<reportStatus>Retrieved</reportStatus>
<currentLocation>
<latitude>12.2165</latitude>
<longitude>43.6518</longitude>
<timestamp>2012-01-03T17:06:16.824+01:30</timestamp>
</currentLocation>
</ns2:result>
</ns2:getLocationForGroupResponse>
</env:Body>
</env:Envelope>
I use this to decode:
$err = curl_error($soap_do);
$result = curl_exec($soap_do);
$xml = simplexml_load_string($result);
$ns = $xml->getNamespaces(true);
$soap = $xml->children($ns['env']);
$getaddressresponse = $soap->body->children($ns['ns2']);
foreach ($getaddressresponse->children() as $item) {
echo (string) $item->address . '<br />';
}
I'm having trouble decoding this with SimpleXML. This link seems most relevant to my situation but I'm unable to apply it to my case as the simpleXML element just
Warning: SimpleXMLElement::children() [simplexmlelement.children]: Node no longer exists in C:\.php on line 33 /*(line with the for each statement)*/
Any suggestions?
UPDATE:
If the server responds with the following error, how would I detect it..?
<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/">
<env:Header xmlns:wsa="http://www.w3.org/2005/08/addressing">
<wsa:To>http://www.w3.org/2005/08/addressing/anonymous</wsa:To>
<wsa:Action>http://www.w3.org/2005/08/addressing/fault</wsa:Action>
</env:Header>
<env:Body>
<env:Fault>
<faultcode>env:Server</faultcode>
<faultstring>Service Exception</faultstring>
<detail>
<ns1:ServiceException xmlns:ns1="http://www.csapi.org/schema/parlayx/common/v3_1" xmlns:ns2="http://www.csapi.org/schema/parlayx/terminal_location/v3_1/local">
<messageId>SVC004</messageId>
<text>Trip not Found for this MSISDN</text>
</ns1:ServiceException>
</detail>
</env:Fault>
</env:Body>
</env:Envelope>

Answer 1

Variable and property names are case sensitive and while I was testing it, it turned out there's other stuff as well. The following works:
$soap = $xml->children($ns['env']);
$getaddressresponse = $soap->Body->children($ns['ns2']);
foreach ($getaddressresponse->getLocationForGroupResponse->children($ns['ns2']) as $item)
{
$item = $item->children();
echo $item->address . '<br />';
}
To answer the updated question:
$fault = $soap->Body->children($ns['env']);
if (isset($fault->Fault))
{
// Handle error
}