flickr group photo getter

<?php
/*
	Get photos from a flickr pool and make a cache,
	html output is setup ready for lightbox plugin coolness
	tom@substrakt.co.uk
*/
 
$cacheFile = 'flickrcache.html';
$cacheTime = 4 * 60;
// Serve the cached file if it is older than $cacheTime
if (file_exists($cacheFile) && time() - $cacheTime < filemtime($cacheFile)) {
    include($cacheFile);
    exit;
}
// Start the output buffer
ob_start();
 
// put your code here
$url = 'http://api.flickr.com/services/rest/?method=flickr.groups.pools.getPhotos&api_key=55dac60b830123643c001b2fd317d04b&group_id=1071453%40N23&per_page=30&auth_token=72157616204991191-b5b8c5278b94b68f&api_sig=56647e8e38a3fff7231a3871bed2f848';

$result = simplexml_load_file($url);

foreach ($result->photos->photo as $photo) {
	
	$thumb = 'http://farm'.$photo['farm'].'.static.flickr.com/'.$photo['server'].'/'.$photo['id'].'_'.$photo['secret'].'_m.jpg';
	$med = 'http://farm'.$photo['farm'].'.static.flickr.com/'.$photo['server'].'/'.$photo['id'].'_'.$photo['secret'].'.jpg';
	
	echo '<a href="'.$med.'" rel="lightbox" title="Added by '.$photo['ownername'].'">';
	echo '<img src="'.$thumb.'" alt="'.$photo['title'].'" />';
	echo '</a>';
}
 
// Cache the contents to a file
$cached = fopen($cacheFile, 'w');
fwrite($cached, ob_get_contents());
fclose($cached);
ob_end_flush(); // Send the output to the browser 
?>