Prevent Multiple Submissions on the Server Side in PHP
Description
The following code shows how to prevent Multiple Submissions on the Server Side.
Example
<html>//from w w w . ja v a 2 s . c o m
<body>
<form action="index.php" method="post">
<input type="hidden" name="submitted" value="yes" /> Your Name: <input
type="text" name="yourname" maxlength="150" /><br />
<input type="submit" value="Submit" style="margin-top: 10px;" /></form>
</body>
</html>
<?php
session_start ();
if (! isset ( $_SESSION ['processing'] )) {
$_SESSION ['processing'] = false;
}
if ($_SESSION ['processing'] == false) {
$_SESSION ['processing'] = true;
//validation
if ($file = fopen ( "test.txt", "w+" )) {
fwrite ( $file, "Processing" );
} else {
echo "Error opening file.";
}
echo $_POST ['yourname'];
unset ( $_SESSION ['processing'] );
}
?>