Create flickr url from simplexml

[bravo14]

I am trying to create a flickr url using the XML file from the site

 

the code I am using is as follows

 

 
<?php
$file="http://api.flickr.com/services/rest/?method=flickr.photosets.getList&api_key=7952c4f1e6dfd2ae1420aec860616f6e&user_id=93306691%40N08&format=rest&auth_token=72157636755071086-2072507680111a83&api_sig=8032afd164bff4d17c4574ae246ce92b";
$sets=simplexml_load_file($file);
 
foreach($sets->xpath('//photoset') as $set){
echo '<a><li><img src="http://farm'.$set{farm-id}.'.staticflickr.com/'.$set{server-id}.'/'.$set{id}.'_'.$set{secret}.'.jpg"/><h3>'.$set->title.'</h3></li></a>';
}
//print_r($sets);
?>

 

The XML is laid out as below

 

<photosets cancreate="1" page="1" pages="1" perpage="13" total="13">
    <photoset id="72157634817057978" primary="9378217918" secret="66a440b8e3" server="3753" farm="4" photos="28" videos="0" needs_interstitial="0" visibility_can_see_set="1" count_views="34" count_comments="0" can_comment="1" date_create="1374935118" date_update="1374954932">
        <title>Coventry v Birmingham - 26-07-13</title>
        <description>Photos of the occasion when the Birmingham Brummies ascended to the top of the Elite League table.</description>
    </photoset>
</photosets>

 

But I am getting the following error displayed

 

• Notice: Use of undefined constant farm - assumed 'farm' in /home/sites/birminghambrummies.co/public_html/library/flickr_sets.php on line 6 Notice: Use of undefined constant id - assumed 'id' in /home/sites/birminghambrummies.co/public_html/library/flickr_sets.php on line 6 Notice: Use of undefined constant server - assumed 'server' in /home/sites/birminghambrummies.co/public_html/library/flickr_sets.php on line 6 Notice: Use of undefined constant id - assumed 'id' in /home/sites/birminghambrummies.co/public_html/library/flickr_sets.php on line 6 Notice: Use of undefined constant id - assumed 'id' in /home/sites/birminghambrummies.co/public_html/library/flickr_sets.php on line 6 Notice: Use of undefined constant secret - assumed 'secret' in /home/sites/birminghambrummies.co/public_html/library/flickr_sets.php on line 6

The parameters I need are within the photoset tag and not tags on their own.

 

Any help would be great

[codebyren]

Firstly, you are trying to access an attribute called "farm" as "farm-id" and "server" as "server-id".  You probably want :

$set['farm']

and not:

$set{farm-id}

Likewise with server vs server-id.

 

Then, note the presence of the quotes wrapping 'farm-id' which stops PHP from treating "farm" and "id" as separate constants - which is what caused your "Use of undefined constant XYZ" errors.