Refreshing uploaded pictures (caching?)

[moggy]

Hiya,

I have a scriptin a CMS to upload images. The form and the script are both on the same page- the script is activated on the form submission. The script structure is as follows:

• Resize Image
• Save Image
• Write Image to DB
• Use 'header:' to reload the page -exact code is:

  header('Location: categories_image_edit.php?record_number=' . $record_number);

The page IS refreshing, but the pictures are not reloading to show the new ones from the db- I have to manually refresh the browser to make this work.

I suspect this is a caching issue - does anyone know?

My headers are set as:

session_start(); 
header("Cache-control: private"); //IE 6 Fix 
header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT"); // Date in the past

Thanks!

[jsim]

The basic idea is to use random value.
If your script show raw picture istead of HTML page that contains img tag then you need to relocate to address something like this:

<?php

header('Location: categories_image_edit.php?record_number=' . $record_number.'&rnd='.rand(10000,99999));

?>

If you generate HTML page that contains img tag then write

<?php

echo '<img src="image_url.jpg?rnd="'.rand(10000,99999).'">';

?>

Cache-control not always works. The browser can even ignore it.
But with random value you can be assure that image will be reloaded every time.
Hope you got the idea.

[moggy]

It works, Fantastic, thanks very much! Top tip!

I'm very very happy now ;-)