read xml with various namespaces with php - php

Question

I have to parse an xml file that contains various namespaces.
I have already registered the namespaces.
My problem is that I cannot extract the data from the cal:location block.
For example i need the vcard:street-address or the vcard:postal-code.
XML - Example:
<channel>
<title>Veranstaltungen zum Thema Markt+Bauer vom 05.05.2011 bis 05.05.2012</title>
<link>https://www.wien.gv.at/vadb/internet/AdvPrSrv.asp?Layout=VAErgebnis_neu&Type=S&ganzjaehrig=ja</link>
<description> Veranstaltungen zum Thema Markt+Bauer vom 05.05.2011 bis 05.05.2012 </description>
<lastBuildDate>Sa,05 Jän 2013 17:38:05 GMT</lastBuildDate>
<ManagingEditor>event#ma55.wien.gv.at</ManagingEditor>
<language>de-AT</language>
<dc:license>http://data.wien.gv.at/nutzungsbedingungen</dc:license>
<dc:rightsHolder>Stadt Wien</dc:rightsHolder>
<item>
<title>Bauernmarkt am Karmelitermarkt</title>
<link>https://www.wien.gv.at/vadb/internet/AdvPrSrv.asp?Layout=VAErgebnis_neu&Type=K&ID=256811&return=</link>
<guid isPermaLink="false">https://www.wien.gv.at/vadb/internet/AdvPrSrv.asp?Layout=VAErgebnis_neu&Type=K&ID=256811&return=</guid>
<description><![CDATA[
<p>07.01.2011 bis 31.12.2011<br />
08:00 bis 13:00<br />
Karmelitermarkt<br />http://www.wiener-maerkte.at</p>­<p>Spezieller Bauernmarkt mit köstlichen naturreinen Produkten.</p>]]>
</description>
<category>Kulinarischer Markt</category>
<dc:subject>Kulinarischer Markt</dc:subject>
<cal:dtstart>2011-01-07T00:00:00+01:00</cal:dtstart>
<cal:dtend>2011-12-31T00:00:00+01:00</cal:dtend>
<cal:byday>Fr, Sa</cal:byday>
<cal:byhour>08</cal:byhour>
<cal:byminute>00</cal:byminute>
<cal:location>
<vcard:fn>Karmelitermarkt</vcard:fn>
<vcard:street-address>Haidgasse 1</vcard:street-address>
<vcard:postal-code>1020</vcard:postal-code>
<vcard:tel/>
<vcard:fax/>
<vcard:email>office#wiener-maerkte.at</vcard:email>
<vcard:url>http://www.wiener-maerkte.at</vcard:url>
</cal:location>
<cal:organizer>
<vcard:fn>Wiener Einkaufsstraßen-Management</vcard:fn>
<vcard:street-address>Hietzinger Kai 133</vcard:street-address>
<vcard:postal-code>1130</vcard:postal-code>
<vcard:tel>0043-1/514 50-6700</vcard:tel>
<vcard:fax>0043-1/514 50-6749</vcard:fax>
<vcard:email/>
<vcard:url>http://www.einkaufsstrassen.at</vcard:url>
</cal:organizer>
</item>
</channel>
My PHP - Code:
<?php
function download_feed($path){
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$path);
curl_setopt($ch, CURLOPT_FAILONERROR,1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
curl_setopt($ch, CURLOPT_TIMEOUT,15);
$retValue = curl_exec($ch);
curl_close($ch);
return $retValue;
}
$sXML = download_feed('xml - Example');
$oXML = new SimpleXMLElement($sXML);
foreach($oXML->channel->item as $oDocument){
$title = $oDocument->title;
$url = $oDocument->link;
$namespaces = $oDocument->getNameSpaces(true);
$cal = $oDocument->children($namespaces['cal']);
$vcard = $cal->children($namespaces['vcard']);
$dc = $oDocument->children($namespaces['dc']);
$georss = $oDocument->children($namespaces['georss']);
$byday = $cal->byday;
//var_dump($vcard);
$attrs = $oDocument->getElementsByTagName("vcard:fn");
$streetAddress = $oDocument->{'cal:location'}->{'vcard:fn'};
echo $title . "<br>" . $url . "<br>" . $byday. "<br>" . $streetAddress. "<br><br>";
}
?>

Answer 1

You've misunderstood the purpose of the ->children() method: it doesn't "register" namespaces, it selects them for immediate use.
So to get to <cal:location>, you can use $oDocument->children($namespaces['cal'])->location, and the <vcard:fn> inside that would be $oDocument->children($namespaces['cal'])->location->children($namespaces['vcard'])->fn
Since PHP 5.2, you can also use prefixes directly, rather than looking up their URLs, by giving the ->children() method an extra parameter of true: $oDocument->children('cal', true)->location->children('vcard', true)->fn