I have no idea if this is possible or feasible, but I find myself with few alternatives. Basically, I have a PHP file outputting a different image at given intervals of time. I specifically want the "image" located at the PHP file's URI to expire every hour on the hour, with the change of this image, so that the new image may be viewed. However, if I use PHP to output the headers, they are ignored and don't reach the client because of .htaccess at a higher level, and because .htaccess is cascading. The rules are specifically: Re-specifying this on a lower level would not be ideal, as I cannot specify H:00:00 or anything like that, and "access plus 1 hour" would not be what I'm trying to achieve. I initially had the reflex to try making PHP that had a symbolic .htaccess pointing to it, but then realized that what it output would not likely be read by Apache (I think?) because if I recall, .htaccess is strictly server-side, and everything is parsed on a level higher, and before anything would be run through php. So, I either need some way to create an .htaccess file with dynamic content, or a way to un-specify the rules I mentioned above so that the headers I'm trying to output in my PHP file will make it. Thanks in advance for anyone who takes the time to read this. =]