problem with self submitting forms refreshing

[jakeyjake]

I have a form that is self submitting, however if a user hits f5 or enter the information is resent. Im not using a database as a backend so i cant check for mysql_insert_id and i dont really want to use sessions or header:redirect as the whole idea is to display a successblock to the user containing the information they entered. i have error checking in the form so the form may be sent multiple times to check for errors. Is there a way that you can use a hidden variable such as formsent or something to stop the user being able to send a million emails??

Cheers
Jake

[leatherback]

Hi,

These are two things, I think:

F% (I assume that is a reload?) will cause the original data to be resubmitted. Here a hidden variable is not going to help. You could consider loggin on the server in a file which IP numbers have submited the form over the pas 5 minutes, or setting a cookie?

Enter will resubmit the <newly loaded> form. Here a hidden variable which is default 0, and only after submitting get set to 1 is a solution. You could include it in the form:

if($email)
  {
  $submitted = 1;
  }
else
  {
  $submitted = 0;
  }
...
...
$form = "
<input type=\"hidden\" value=\"$submitted\" name=\"submitted\">":