XML attributes and PHP [duplicate] - php

Question

This question already has answers here:
Reference - How do I handle Namespaces (Tags and Attributes with a Colon in their Name) in SimpleXML?
(2 answers)
Closed 1 year ago.
I have this as xml:
<root xmlns:event="http://www.webex.com/schemas/2002/06/service/event">
<event:event>
<event:sessionKey></event:sessionKey>
<event:sessionName>Learn QB in Minutes</event:sessionName>
<event:sessionType>9</event:sessionType>
<event:hostWebExID></event:hostWebExID>
<event:startDate>02/12/2009</event:startDate>
<event:endDate>02/12/2009</event:endDate>
<event:timeZoneID>11</event:timeZoneID>
<event:duration>30</event:duration>
<event:description></event:description>
<event:status>NOT_INPROGRESS</event:status>
<event:panelists></event:panelists>
<event:listStatus>PUBLIC</event:listStatus>
</event:event>
...
</root>
How can I loop through all of the event:event nodes and display, for example, all of the event:SessionKey's?
This does not work:
$xml = new SimpleXMLElement($r);
$xml->registerXPathNamespace('e', 'http://www.webex.com/schemas/2002/06/service/event');
foreach($xml->xpath('//e:event') as $event) {
var_export($event->xpath('//e:sessionKey'));
}

Answer 1

it does work without registerXPathNamespace and the full namespace prefix in the xpath queries:
$xml = new SimpleXMLElement($r);
foreach($xml->xpath('//event:event') as $event) {
var_export($event->xpath('event:sessionKey'));
}

Answer 2

You have to register the namespace for each simpleXMLElement object you use.
$xml = new SimpleXMLElement($r);
$xml->registerXPathNamespace('e', 'http://www.webex.com/schemas/2002/06/service/event');
foreach($xml->xpath('//e:event') as $event) {
$event->registerXPathNamespace('e', 'http://www.webex.com/schemas/2002/06/service/event');
var_export($event->xpath('//e:sessionKey'));
}
The namespace should also be declared somewhere in the xml file.
<event:event xmlns:event="http://www.webex.com/schemas/2002/06/service/event">
...
The method ax described works too. You can skip the registerXPathNamespace if you know the xml file will always use the same prefix.

Answer 3

Having worked a lot with simplexml, this is how I do it.
The magic trick if you already have an element and just want to get its different namespaced children, say for a structure like this:
<entry>
<title type="text">My test entry</title>
<gd:when startTime="2017-02-26T02:00:00Z" endTime="2017-02-26T03:00:00Z"/>
<gc:notes type="string">A type</gc:notes>
</entry>
Is to send TRUE as the second parameter to the children function:
$title = (string) $entry->title;
$gd = $entry->children('gd', TRUE);
$attrs = $gd->when->attributes();
$startTime = (string) $attrs->startTime;
$gc = $entry->children('gc', TRUE);
$notes = (string) $gc->notes();

Answer 4

here alternative that worked for me.
$xml = simplexml_load_string($r);
$ns = $xml->getNamespaces(true);
foreach ($xml->children($ns['event'])->event as $skey) {
$sessionKey = $skey->children($ns['event'])->sessionKey;
echo $sessionKey;
}

Answer 5

Another approach is to use SimpleXML for parsing and DOMDocument for manipulation/access, which bypasses namespacing issues altogether:
$xml = new SimpleXMLElement($r);
$xml = dom_import_simplexml($xml);
$nodelist= $xml->getElementsByTagName('event');
for($i = 0; $i < $nodelist->length; $i++) {
$sessions = $nodelist->item($i)->getElementsByTagName('sessionKey');
echo $sessions->item(0)->nodeValue;
}

Answer 6

Using registerXPathNamespace and then calling xpath didn't actually work for me.
I had to go with the solution provided in this great post : http://blog.preinheimer.com/index.php?/archives/172-SimpleXML,-Namespaces-Hair-loss.html
So in your case, this :
echo $xml->children('http://www.webex.com/schemas/2002/06/service/event')->sessionName;
Will output:
Learn QB in Minutes