Improved Del.icio.us caching

I was using this code to cache delicious feeds in my sidebar; however whenever it couldn’t access delicious it would replace my feed with an ugly warning message. The delicious cached plugin does this better – but it falls short in that it doesn’t allow for multiple feeds. I solve this problem by creating a top level folder (writable by the system) called “delicious” and putting multiple copies of my own script with slightly different names for each feed. i.e. “blogroll.inc” or “favorites.inc” – each producing a differently named cache file in the same folder. My script is an amalgam of the two scripts mentioned above, and I thought I’d share it because this has been very useful for me. Hopefully someone will eventually write a more robust delicious caching plugin which allows for multiple feeds from different tags.

This example uses the tag “blogroll” and produces a cached file: “blogroll.html.”

<?php
$username = "USERNAME";
$user = "USERNAME/blogroll";
$opts = "?count=20&tags=no&rssbutton=no&bullet=";
$url = "https://del.icio.us/html/";
$cachefile = "delicious/blogroll.html"; // name of cache file
$cachetime = 60 * 60; // 60 minutes

// if cache is valid, just use it instead of hitting del.icio.us
if (file_exists($cachefile) && (time() - $cachetime < filemtime($cachefile)))
{
include($cachefile);
} else {
$c = curl_init($url . $user . $opts);
// cURL options
curl_setopt($c, CURLOPT_RETURNTRANSFER,1);
curl_setopt($c, CURLOPT_USERPWD,"$username");
curl_setopt($c, CURLOPT_CONNECTTIMEOUT, 2);
curl_setopt($c, CURLOPT_TIMEOUT, 4);
curl_setopt($c, CURLOPT_USERAGENT, "del.icio.us cached 1.4 / https://www.w-a-s-a-b-i.com");
$response = curl_exec($c);
$info = curl_getinfo($c);
$_curl_error_code = $info['http_code'];

if($_curl_error_code == 200) {
echo $response;

$fp = fopen($cachefile, 'w');
fwrite($fp, $response);
fclose($fp);
} else {
include($cachefile);
}
}
?>