Prevent Form resubmission upon hitting back button

Question

I have searched many posts here and elsewhere but can\'t seem to find a solution to my problem. I have a page which displays database entries: database.php. These entries c

Answer 1

An alternative solution that also works if/when the page is reloaded involves checking the post's originality using $_SESSION. In a nutshell, check for a unique or random string.

In the form, add an input element with a value set using rand() or microtime():

And then wrap the PHP function to validate and parse the form data in an if block:

if(!isset($_SESSION['formToken']) || $_POST['formToken'] !== $_SESSION['formToken'])){
       $_SESSION['formToken'] = $_POST['formToken'];
      /*continue form processing */
}