On 7/27/07, brian <phplist@xxxxxxxxxxxxxxx> wrote:
Tijnema wrote:
> On 7/26/07, Dan <frozendice@xxxxxxxxx> 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
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