$con=mysqli_connect(LOGINDETAILS);
/*if (!$con) {
die("Can not connect: " . mysql_error());
}
*/

$Username = $_POST['Username'];

$pswd = $_POST['pswd'];
$pswd = md5($pswd);

$sql="INSERT IGNORE INTO CyberSecurity (pswd, Username)
VALUES('$pswd', '$Username')";

mysqli_query($con,$sql);
echo "The password that you provided has been stored in our database for research purposes.";
mysqli_close($con);
?>

INSERT INTO CyberSecurity (username, password)
    VALUES ('$username', '$password')
    ON DUPLICATE KEY UPDATE password = '$password';