php xml schema formatting - php

Question

I have a php page what post's a xml to Heartinternet API and after a long time I have got it to work but now I cant find away to only pull only one part out of the replyed XML
$some_xml = '<?xml version="1.0"?>
<epp xmlns="urn:ietf:params:xml:ns:epp-1.0" xmlns:package="http://www.heartinternet.co.uk/whapi/package-2.2">
<command>
<info>
<package:info>
<package:id>171371a16973b1bf</package:id>
</package:info>
</info>
<extension>
<ext-package:preAuthenticate xmlns:ext-package="http://www.heartinternet.co.uk/whapi/ext-package-2.2"/>
</extension>
<clTRID>fac89208bea460fa3fef11b22a519cce</clTRID>
</command>
</epp>';
This is the code what is posted to the API. Full code can been seen here.
This is what I get back and can't figure out how to pull one line from the reply.
<?xml version='1.0'?>
<epp xmlns="urn:ietf:params:xml:ns:epp-1.0" xmlns:ext-package="http://www.heartinternet.co.uk/whapi/ext-package-2.2">
<response>
<result code='1000'>
<msg>Command completed successfully</msg>
</result>
<resData>
<ext-package:redirectURL>http://bobcp.example.org/sso.cgi?session=LUB9UNbw6jTW</ext-package:redirectURL>
</resData>
<trID>
<clTRID>fac89208bea460fa3fef11b22a519cce</clTRID>
<svTRID>test-19272326601ef4c3bf6b64730d09c6cf</svTRID>
</trID>
</response>
</epp>
The one line I need to show is ext-package:redirectURL.
If anyone could help me or point me in the right direction to find how to sort this I would be grateful!

Answer 1

You can get the redirect url by registering the namespace urn:ietf:params:xml:ns:epp-1.0 and then you could use an xpath expression for example. In this case, I have chosen u as the prefix.
/u:epp/u:response/u:resData/ext-package:redirectURL
Using SimpleXML with your returned xml:
The response xml from the comments is slightly different. This is the updated code:
$returned_xml->registerXPathNamespace('u', 'urn:ietf:params:xml:ns:epp-1.0');
$returned_xml->registerXPathNamespace('ext-package', 'http://www.heartinternet.co.uk/whapi/ext-package-2.2');
$redirectUrl = $returned_xml->xpath('/u:epp/u:response/u:resData/ext-package:redirectURL');
echo $redirectUrl[0];
Or with DOMDocument:
$doc = new DOMDocument();
$doc->loadXML(file_get_contents("https://custom-hosting.co.uk/source/test.php"));
$xpath = new DOMXpath($doc);
$xpath->registerNamespace('u', 'urn:ietf:params:xml:ns:epp-1.0');
$xpath->registerNamespace('ext-package', 'http://www.heartinternet.co.uk/whapi/ext-package-2.2');
$redirectUrl = $xpath->query('/u:epp/u:response/u:resData/ext-package:redirectURL')->item(0)->nodeValue;
echo $redirectUrl;
That will give you for example:
http://bobcp.example.org/sso.cgi?session=LUB9UNbw6jTW

Answer 2

<?xml version='1.0'?>
<epp xmlns="urn:ietf:params:xml:ns:epp-1.0" xmlns:ext-package="http://www.heartinternet.co.uk/whapi/ext-package-2.2">
<response>
<result code='1000'>
<msg>Command completed successfully</msg>
</result>
<resData>
<ext-package:redirectURL>http://bobcp.example.org/sso.cgi?session=LUB9UNbw6jTW</ext-package:redirectURL>
</resData>
<trID>
<clTRID>fac89208bea460fa3fef11b22a519cce</clTRID>
<svTRID>test-19272326601ef4c3bf6b64730d09c6cf</svTRID>
</trID>
</response>
</epp>
that is what i get sent back from the API its not in my test page at all
Full page source
if i add
$xml = simplexml_load_string($returned_xml);
$xml->registerXPathNamespace('u', 'urn:ietf:params:xml:ns:epp-1.0');
$redirectUrl = $xml->xpath('/u:epp/u:response/u:resData/ext-package:redirectURL');
echo $redirectUrl[0];
to the page i just get
XML Parsing Error: no element found
Location: https://custom-hosting.co.uk/
Line Number 1, Column 1: