Getting certain attribute value in an element with multiple values using xpath PHP

Question

Hi, i'm playing around with flickr API lately and having difficulties in parsing their response to extract the info i need,

here is a sample response:

−
<rsp stat="ok">
−
<sizes canblog="0" canprint="0" candownload="1">
<size label="Square" width="75" height="75" source="http://farm3.static.flickr.com/2306/1555710063_d2c1e7e7cd_s.jpg" url="http://www.flickr.com/photos/30561311@N00/1555710063/sizes/sq/" media="photo"/>
<size label="Thumbnail" width="100" height="67" source="http://farm3.static.flickr.com/2306/1555710063_d2c1e7e7cd_t.jpg" url="http://www.flickr.com/photos/30561311@N00/1555710063/sizes/t/" media="photo"/>
<size label="Small" width="240" height="160" source="http://farm3.static.flickr.com/2306/1555710063_d2c1e7e7cd_m.jpg" url="http://www.flickr.com/photos/30561311@N00/1555710063/sizes/s/" media="photo"/>
<size label="Medium" width="500" height="333" source="http://farm3.static.flickr.com/2306/1555710063_d2c1e7e7cd.jpg" url="http://www.flickr.com/photos/30561311@N00/1555710063/sizes/m/" media="photo"/>
<size label="Original" width="1280" height="853" source="http://farm3.static.flickr.com/2306/1555710063_e081a6600a_o.jpg" url="http://www.flickr.com/photos/30561311@N00/1555710063/sizes/o/" media="photo"/>
</sizes>
</rsp>

now i need the get just the source attribute value where the size attribute value is Medium

here is how i'm trying to do that with xpath

$xml = new SimpleXMLElement($result);
$path = '//size[label="Medium"]@source';
$url  $xml->xpath($path);

i tried all kind of xpath query combinations but i cant get to the right query

any ideas on that?

Answer 1

Missing closing quote after Medium.

Answer 2

I think you have a mising @ for label because it's an attribute:

'//size[@label="Medium"]@source'

Answer 3

OK so looks like the right combination that made this work is

'//size[@label="Medium"]/@source'

Thanks guys :)