How can i only fetch a (rss/atom) feed when it's changed?

From: Date: Tue, 02 Oct 2007 22:43:04 +0000
Subject: How can i only fetch a (rss/atom) feed when it's changed?
Groups: php.general 
Request: Send a blank email to php-general+get-262656@lists.php.net to get a copy of this message
Hey, I'm currently fetching feeds about every hour (automatically in php) but sometimes there are no new updates in a feed for 2 hours. so no i wonder if it's possible to check the feed somehow to see if it changed since i last fetched it and if it's the case than download it like it should.. if it's not changed than just skip the download. Is this possible and how (with filemtime?)? i rather have a method that works in php 4 and 5 (i use php 5 but alot of hosts still don't). thanx, Mark.

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