Turn off Caching for rss? - Cachemgr

[jnich05]

This code caches 2 things - an rss feed, and images inside the rss feed. It places them both into a folder "c/" on the server. I want to keep the images cached basically forever, so I've set the $cachelife to the something like 20 years (only shows 7200 seconds here in this script though).

 

What I'm trying to figure out is how to remove the caching of the rss files. The rss feeds get updated fairly often and I'm stuck with ancient feeds because both are set to the time limit of the image caching.

 

In the script where it says "// now the rss cache file", there's gotta be a way to set it to 0, or no-cache somehow.

 

I've been working on this all weekend and I've just about lost my mind. I really need to learn php better.

 

<?php

class cacheMgr {

// how long is the cache lifetime - in seconds? 
var $cachelife = 7200;

/*
* Constructor 
*	- verifies that cache dir exists and is writeable
*	- sets up images and pages dirs
*	
*/
function __construct() {

// verify that the cache dir exists andis writeable...
if(!file_exists( 'c' )) {
	echo 'Cache directory "c" needs to be created for cache support to work';
	exit;
}
if(file_exists( 'c' ) && !is_writeable( 'c')) {
	echo  'Cache directory "c" exists, but is not writeable' ;
	exit;
}
}

/*
* Checks to see if an image id is cached 
*
* @param $cacheid -  the image file to test - (ex: abcdefg.jpg)
*
* @return true if image exists in cache, false otherwise
*
*/
function is_image_cached( $cacheid ) {

if( file_exists( 'c/' . $cacheid )) {

	$cachetime = time() - $this->cachelife;
	if(  filemtime( 'c/' . $cacheid ) < $cachetime ) {  // expired - blast it
		unlink( 'c/	'. $cacheid );
		return false;
	}
	return true;
}
return false;
}

/*
* Iterate over cached resources, removing any that have expired
*
* @return - true if the cache cleanup completes sucessfully
*
*/
function clean_cache( ) {

// images first..
$dh = opendir( 'c' );
$cachetime = time() - $this->cachelife;

while (false !== ($fname = readdir($dh) ) ) {

	if( is_dir( $fname )) continue;  // ignore '.' and '..'

	if( filemtime( 'c/'. $fname ) < $cachetime ) {  // expired -- blast it.
		unlink( 'c/'. $fname );
	}		
}

closedir( $dh );

// now the rss cache file
$dh = opendir( 'c' );
$cachetime = time() - $this->cachelife;
while (false !== ($fname = readdir($dh) ) ) {

	if( is_dir( $fname )) continue;  // ignore '.' and '..'

	if(strstr($fname, "rsscache" )) {
		unlink( 'c/'.$fname);	
	} 	

}

return true;
}

/*
* Set the lifetime of the cache (in seconds) 
*
* @param $lifetime - seconds to keep the cache alive (3600 = 1hr)
*
*/ 
function set_lifetime( $lifetime ) {
$this->cachelife = $lifetime;
}

/*
* Get the lifetime of the cache (in seconds)
*
* @return $lifetime - returns the number of seconds to keep the cache alive (3600 = 1hr)
*
*/
function get_lifetime() {
return $this->cachelife;
}


}


?>