Dear Friends,


I have developed site which will gives effect on a image with the help of image_filter() of PHP 5.2. eg contract, grey scale, emboss etc...

Effect applied properly on image, but IE cannot refresh this page until I press F5 key. However this code works fine with FireFox, NetScape, Opera.

To overcome from this problem I had go to settings of IE & select on Every time I visit the Page radio button instead of Automatically under Check for newer version of stored page section.

But end user does not have this idea. So is there is any way to solve this with PHP, JS, HTML ?


Thanking you,


Dhaval Dave

One way to combat this is to attach something different to the page each time it refreshes.

index.php?dummy=1
when this gets called IE caches "index.php?dummy=1234" as the loaded page
so if you call
index.php?dummy=2
even though it is still displaying the same page it will cause it to reload because the dummy variable in the url changed.
I have used mktime() to accomplish this when i needed too.

Hope this helps.

directly from http://www.php.net/manual/en/function.header.php ....

<?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
?>

This tells the client "DON'T CACHE MY PAGE, FOR THE LOVE OF GOD, DON'T CACHE MEEEE"

Dear Friend,

Kindly thanks for your response. Well sir below code will not work I had already try it before few week.

<?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
?>


index.php?dummy=1 this will also not work. Problem is only raised with IE browser. While it will work nice with FireFox, NetScape.

Plese guide me more.

Thanking you,


Snowby Dave

IE and Firefox handle cache differently (as you have no doubht figured out). With IE you need to add the Pragma header and read this article on it:

http://www.w3schools.com/php/func_http_header.asp

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The above header recommendations should work as well....
to continue my idea...
When the writing the link that goes to the page give this a try
<a href="page.php?d=<?php echo mktime(); ?>">Link To Page</a>
This will make the link different every time which will cause ie to think it is a new page.
You can even add a md5() around the mktime to make it not look like a timestamp.
Greg

Dear gwhitehead,

My page contain one original image & beside it, it has another image. This image will change when user click on a grey, emboss, smooth, edges, negative text box. When I click on grey button. Image is already converted to Grey in folder. But it will not display grey image on browser. It will display old image until I press F5 or Refresh page.

With url I am passing step parameter with url for keep step track. So anytime user can undo his step. So my url looks like following way

index.php?fn=FILENAME&step=STEP_NO

STEP_NO is increament or decrement, so each time url change. Your <a href="page.php?d=<?php echo mktime(); ?>"> link will not work. I mrsn I had added d=<?php echo mktime(); ?>. But still I have to press F5.

Please guide me more...