delete EGPCS data after refresh

i am getting data by $_POST method from form but when i refresh page following warning occur .

http://img255.imageshack.us/img255/7393/snap1cl8.gif

how can i delete EGPCS(Environment, GET, POST, Cookie, Server ) value when i refresh page

My solution to this was to submit the form to a different PHP file to process the form data, then use the header() function to redirect back to the first PHP file to display results, error, etc. I use a session to carry the data between each file.

I haven't seen a better way yet, really (apart from using an AJAX solution).

My solution to this was to submit the form to a different PHP file to process the form data, then use the header() function to redirect back to the first PHP file to display results, error, etc. I use a session to carry the data between each file.

I haven't seen a better way yet, really (apart from using an AJAX solution).

would you give me a couple of code samples ?