Stop form from sending twice?

[Greyfish]

What is the best way to stop a contact form from sending information twice if the user refreshes the page?

[Yelgnidroc]

Try having a session variable $_SESSION['already_submitted']

Set it to TRUE after processing the form.

Only process the form if it's not TRUE

[apulmca2k4]

Redirect at another thanks page after processing data of form.

[Greyfish]

If don't like sending them to a page thats sole purpose is to say "Thankyou" I'd rather just keep it all on one page.

I can't figure out how to get this session variable thing to work, what is wrong with this?

session_start();
$_SESSION['sent'] = "false";

if (isset($_POST["submit"])){
if ($_SESSION['sent'] == "false"){
$name = $_POST["name"];
$email = $_POST["email"];
$to = "example@example.com";
$subject = $_POST["subject"];
$message = $_POST["message"];
$body = "Full Name: $name\n".
"E-mail Address: $email\n".
"Message: $message";
$header = "From: $email";
mail($to, $subject, $body, $header);
$_SESSION['sent'] = "true";
}
}

[Yelgnidroc]

You are always setting $_SESSION['sent'] = "false";

May be better to do something like:


if(!isset($_SESSION['sent']))
$_SESSION['sent'] = "false";


if (isset($_POST["submit"])){
if ($_SESSION['sent'] == "false"){
$name = $_POST["name"];
$email = $_POST["email"];
$to = "example@example.com";
$subject = $_POST["subject"];
$message = $_POST["message"];
$body = "Full Name: $name\n".
"E-mail Address: $email\n".
"Message: $message";
$header = "From: $email";
mail($to, $subject, $body, $header);
$_SESSION['sent'] = "true";
}
}