RSS cache script

<?php
/**
 * RSS cache script
 *
 * Run this script via cron. I run mine every 15 minutes. This will cache rss feeds on your local 
 * machine in /tmp naming the files rss1.cache, rss2.cache and so on. Have your rss reader access 
 * your rss feeds that are locally stored. This will keep you from getting banned to that rss feed 
 * if you're hitting it on every page load and save you and the rss supplier lots of bandwidth.
 *
 * This script also uses parallel processing. It will go out and grab the rss feeds all at once.
 * Lets say you want to gather data from 5 sites and each site takes 5 seconds to scrape. Gathering
 * each site sequentially would take 25 seconds (5 x 5) for the script to complete. Running the 
 * gathering in parallel allows the script to finish in 5 seconds. The length of the longest scrape.
 *
 * @author Ausome1
 */
 
// URLs of content you wish to cache.
$urls = array('http://example1.com/rss.xml', 
              'http://example2.com/rss.xml', 
              'http://example3.com/rss.xml', 
              'http://example4.com/rss.xml', 
              'http://example5.com/rss.xml'
             );
 
// No need to alter anything past here.
$count = count($urls);
 
// Create cURL instances, set URL, and other appropriate options.
for ($i = 1; $i <= $count; ++$i)
{
	$handle = 'ch' . $i;
	$$handle = curl_init();
	curl_setopt($$handle, CURLOPT_URL, $urls[$i - 1]);
	curl_setopt($$handle, CURLOPT_HEADER, 0);
	curl_setopt($$handle, CURLOPT_RETURNTRANSFER, 1);
}
 
// Create the multiple cURL handle.
$mh = curl_multi_init();
 
// Add handles
for ($i = 1; $i <= $count; ++$i)
{
	$handle = 'ch' . $i;
	curl_multi_add_handle($mh, $$handle);
}
 
$running = NULL;
 
do
{
	curl_multi_exec($mh, $running);
} while ($running > 0);
 
// Retrieve content and write data to cache file.
for ($i = 1; $i <= $count; ++$i)
{
	$handle = 'ch' . $i;
	$data   = 'data' . $i;
	$response_code = 'response_code' . $i;
	$$data = curl_multi_getcontent($$handle);
	$$response_code = curl_getinfo($$handle, CURLINFO_HTTP_CODE);
	if ($$data && $$response_code != '404')
	{
		file_put_contents('/tmp/rss' . $i . '.cache', $$data);
	}
	curl_multi_remove_handle($mh, $$handle);
}
 
// Close curl session.
curl_multi_close($mh);
?>