<?
/*
======================================================================
Get, cache, and output contents of a RSS XML file
Author: George at JavaScriptKit.com/ DynamicDrive.com
Created: Feb 1st, 2006. Updated: Feb 1st, 2006
======================================================================
*/
header('Content-type: text/xml');
// -------------------------------------------------------------------
// Enter list of possible RSS feeds to fetch inside array:
// -------------------------------------------------------------------
$rsslist=array(
"CNN" => "http://rss.cnn.com/rss/cnn_topstories.rss",
"BBC" => "http://newsrss.bbc.co.uk/rss/newsonline_uk_edition/front_page/rss.xml",
"news.com" => "http://news.com.com/2547-1_3-0-5.xml",
"slashdot" => "http://rss.slashdot.org/Slashdot/slashdot",
"dynamicdrive" => "http://www.dynamicdrive.com/export.php?type=new"
);
$cachefolder="cache"; //path to cache directory. No trailing "/". Set dir permission to read/write!
// -------------------------------------------------------------------
// Determine which RSS file to actually fetch
// Based on the value of the "id" parameter of the URL string mapping to the RSS array's key
// -------------------------------------------------------------------
$rssid=$_GET['id'];
$rssurl=isset($rsslist[$rssid])? $rsslist[$rssid] : die("Error: Can't find requested RSS in list.");
$localfile=$cachefolder. "/" . urlencode($rssurl); //Name cache file based on RSS URL
// -------------------------------------------------------------------
// Get the minutes to cache the local RSS file based on "cachetime" parameter of URL string
// -------------------------------------------------------------------
$cacheminutes=(int) $_GET["cachetime"]; //typecast "cachetime" parameter as integer (0 or greater)
// -------------------------------------------------------------------
// fetchfeed() gets the contents of an external RSS feed,
// and saves its contents to the "cached" file on the server
// -------------------------------------------------------------------
function fetchfeed(){
global $rssurl, $localfile;
$contents=file_get_contents($rssurl); //fetch RSS feed
$fp=fopen($localfile, "w");
fwrite($fp, $contents); //write contents of feed to cache file
fclose($fp);
}
// -------------------------------------------------------------------
// outputrsscontent() outputs the contents of a RSS feed using the cached local RSS file
// It checks if a cached version of the RSS feed is available, and if not, creates one first.
// -------------------------------------------------------------------
function outputrsscontent(){
global $rssurl, $localfile, $cacheminutes;
if (!file_exists($localfile)){ //if cache file doesn't exist
touch($localfile); //create it
chmod($localfile, 0666);
fetchfeed(); //then populate cache file with contents of RSS feed
}
else if (((time()-filemtime($localfile))/60)>$cacheminutes) //if age of cache file great than cache minutes setting
fetchfeed();
readfile($localfile); //return the contents of the cache file
}
outputrsscontent();
?>
Comment