Re: Is it possible to stop an image from being cached?

Well, this is only one specific image that constantly changes, the rest of the page is handled regularly. From what you've said if I go with this header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1 header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past That will effect only the one specific image I use this on when generating it right? - Dan "Tijnema" <tijnema@gmail.com> wrote in message news:d8269d910707261632k2d649476l102453e93eabf34d@mail.gmail.com...

On 7/27/07, Dan <frozendice@gmail.com> wrote:

Is this header you're refering to the header of the page which contains the image, or the image itself? - Dan

The image itself. Also note, that if you use my solution 2, you still might get problems, as the page that is calling might be cached, and in the cached page, it refers to the image with the same unique code, and it will use the cached image again. Also, if you use solution 2, the image will still stay forever in the temp folder of the browser(unless the user is cleaning it). If you use solution 1, the browser will keep it only for this page, and will remove it afterwards. Tijnema

"Tijnema" <tijnema@gmail.com> wrote in message news:d8269d910707261527o7ac08edap61802a712fbac7da@mail.gmail.com...

On 7/27/07, brian <phplist@subtropolix.org> wrote:

Tijnema wrote:

On 7/26/07, Dan <frozendice@gmail.com> wrote:

I have a situation where there is a single image let's call it somebody.jpg. I want to be able to dynamicly create this image using php, basicilly I have PHP set to handle .jpg files also, so I then go through and create an image based upon some info I get from a database call and then use header('Content-Type: image/jpeg'); passthru($file); to send the image to the user. My problem is once they view the image their browser "helpfully" caches it so they don't have to download it again. Is there any tactic short of changing the name constantly of the image to avoid browser caching of an image? - Dan

Solution 1: Send a header() that avoids caching (can't remember it exactly)

You can try: header('Cache-Control: no-store, no-cache, must-revalidate, Post-Check=0, Pre-Check=0'); brian

That's HTTP/1.1 only, but this is what I got from PHP site: <?php header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1 header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past ?> Tijnema -- Vote for PHP Color Coding in Gmail! -> http://gpcc.tijnema.info

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