Parsing an XML Caldav request in php - php

Question

I'm trying to parse a request sent by ThunderBird to my CalDAV Server and from an example taken from stackoverflow with an XML like :
<?xml version="1.0" encoding="ISO-8859-1"?>
<products>
<last_updated>2009-11-30 13:52:40</last_updated>
<product>
<element_1>foo</element_1>
<element_2>foo</element_2>
<element_3>foo</element_3>
<element_4>foo</element_4>
</product>
</products>
Using the function :
$XMLr = new XMLReader;
$XMLr->open('test.xml');
$doc = new DOMDocument;
// move to the first <product /> node
while ($XMLr->read() && $XMLr->name !== 'product');
// now that we're at the right depth, hop to the next <product/> until the end of the tree
$node = simplexml_import_dom($doc->importNode($XMLr->expand(), true));
// now you can use $node without going insane about parsing
$children = $node->children();
foreach($children as $child)
{
echo $child->getName();
echo "\n";
}
I get the answer "element_1 element_2 element_3 element_4 ", but if I use the same function on my request :
<?xml version="1.0" encoding="UTF-8"?>
<D:propfind xmlns:D="DAV:" xmlns:CS="http://calendarserver.org/ns/" xmlns:C="urn:ietf:params:xml:ns:caldav">
<D:prop>
<D:resourcetype/>
<D:owner/>
<D:current-user-principal/>
<D:supported-report-set/>
<C:supported-calendar-component-set/>
<CS:getctag/>
</D:prop>
</D:propfind>
Replacing $XMLr->name !== 'product' by $XMLr->name !== 'D:prop' I get a white screen...
What do I do wrong ?
How can I get the answer "ressourcetype owner current-user-principal etc ..." ?

Answer 1

I try with XMLReader and simplexml_import_dom without success but in opposite, with DomDocument you can do it:
// Just for display test results
$break_line = '<br>';
if (php_sapi_name() === 'cli') {
$break_line = "\n";
}
$xml = '<?xml version="1.0" encoding="UTF-8"?>
<D:propfind xmlns:D="DAV:" xmlns:CS="http://calendarserver.org/ns/" xmlns:C="urn:ietf:params:xml:ns:caldav">
<D:prop>
<D:resourcetype/>
<D:owner/>
<D:current-user-principal/>
<D:supported-report-set/>
<C:supported-calendar-component-set/>
<CS:getctag/>
</D:prop>
</D:propfind>';
$xml_document = new DomDocument(); // http://fr2.php.net/manual/fr/class.domdocument.php
$xml_document->loadXML($xml); // Or load file with $xml_document->load('test.xml);
$elements = $xml_document->getElementsByTagName('prop');
// $elements is a DOMNodeList object: http://fr2.php.net/manual/fr/class.domnodelist.php
foreach($elements as $element) {
// $element is a DOMElement object: http://fr2.php.net/manual/fr/class.domelement.php
$childs = $element->childNodes;
// $childs is DOMNodeList
foreach ($childs as $child) {
// $element is a DOMElement object
if ($child instanceof DOMElement) {
echo $child->nodeName . $break_line;
}
}
}

Answer 2

White screen normally means error.
Put error_reporting on E_ALL
error_reporting('E_ALL');