Warning : Page has expired

furious5

I was wondering if anyone can advise me on a problem I am having.

I have a number of search pages on a site, it searches fine. However I have noticed that if a user clicks on a result and then tries to return to the results page after viewing that page (using the back button on the browser) the user gets a an error message: Warning : Page has expired

On the results page, all the SQL is built dynamically as variables are passed from the search page. So I guess this is causing the time out error.

Someone suggested that it is because I am using the POST method as opposed to the GET method when submitting a form but I can't see this.

Any ideas of the best way to get around this?

I was thinking about writing the SQL to a session, or possibly passing the final SQL in to a variable and storing that in a temporary function?

Sayonara

Instead of taking your form variables and using them to query the database, put a script above the page headers that detects form variables being submitted.

Use a redirect to send them as URL variables and process the query from those instead.

furious5

Hmm I sort of understand what you are saying.

Can you give me a code example, so I fully understand??

dankstick

Try sticking this in your code before any output in the PHP file...

session_cache_limiter('private, must-revalidate');

Sayonara

Originally posted by furious5
Hmm I sort of understand what you are saying.

Can you give me a code example, so I fully understand??

Yeah.

Say you were using a simple search of products in a table, and your form submitted a text field called "product". Normally your target page would request $_POST['product'] and use that as the condition in your SQL query.

Instead on your target page you have something like this:

if (!empty($_POST['product'])) {
     header("Location: ?product=" . $_POST['product']);
}

// then script to run the actual query

What this does effectively is take the form data and resubmit it to the page as URL variables, which very nicely side-steps the whole "data must be resent" issue.

🆒