SimpleXML: Working with XML containing namespaces

Question

I am trying to get to the geo information off the google-picasa API. This is the original XML:

<georss:where>
  <gml:Point>
    <gml:pos>35.669998 139.770004</gml:pos>
  </gml:Point>
</georss:where>

I already have come this far, with:

$ns_geo=$item->children($namespace['georss']);
$geo=$ns_geo->children($namespace['gml']);

var_dump($geo) will output

object(SimpleXMLElement)#34 (1) { 
  ["Point"]=> object(SimpleXMLElement)#30 (1) { 
    ["pos"]=> string(18) "52.373801 4.890935" 
  } 
}

but

echo (string)$geo->position or (string)$geo->position->pos;

will give me nothing. Is there something obvious that i am doing wrong?

Tomalak · Accepted Answer · 2010-01-06 18:02:10Z

4

You could work with XPath and registerXPathNamespace():

$xml->registerXPathNamespace("georss", "http://www.georss.org/georss");
$xml->registerXPathNamespace("gml", "http://www.opengis.net/gml");
$pos = $xml->xpath("/georss:where/gml:Point/gml:pos");

From the docs, emphasis mine:

registerXPathNamespace […] Creates a prefix/ns context for the next XPath query.

More ways to handle namespaces in SimpleXML can be found here, for example:
Stuart Herbert On PHP - Using SimpleXML To Parse RSS Feeds

answered Jan 6, 2010 at 18:02

Tomalak

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2 Comments

Richard Over a year ago

thanks, I came to the same conclusion this worked $geo = $feed->xpath('//gml:pos');echo $geo[0]; maybe the other way can't handle nested namespace elements

Richard Over a year ago

actually, I misspelled something.$geo->point should be $geo->Point (uppercase)

Eduardo · Accepted Answer · 2010-01-06 17:51:48Z

0

echo $geo->pos[0];

edited Jan 6, 2010 at 17:51

answered Jan 6, 2010 at 17:27

Eduardo

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1 Comment

Michael Ozeryansky Over a year ago

This method won't access namespaces

Daniel · Accepted Answer · 2012-01-31 21:29:16Z

0

This is how I did it without using xpath:

$georss = $photo->children('http://www.georss.org/georss');
$coords;
if($georss->count()>0) {
    $gml = $georss->children('http://www.opengis.net/gml');
    if($gml->count()>0) {
        if(isset($gml->Point->pos)) {
            $coords = $gml->Point->pos;
        }
    }
}

answered Jan 31, 2012 at 21:29

Daniel

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