Untitled

<?php
/* Check all form inputs using check_input function */
$username = check_input($_POST['username'], "tptunlimited");
$password = check_input($_POST['password'], "B@seball96");
$comments = check_input($_POST['comments'], "comment");
/* If username is not valid show error message */
if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/", $username))
{
show_error("username not valid");
}
/* If password is not valid set $website to empty */
if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/", $password))
{
show_error("password not valid");
}
/* Redirect visitor to the thank you page */
header('Location: thanks.htm');
exit();
/* Functions we used */
function check_input($data, $problem='')
{
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
if ($problem && strlen($data) == 0)
{
show_error($problem);
}
return $data;
}
function show_error($myError)
{
?>
<html>
<body>
<b>Please correct the following error:</b><br />
<?php echo $myError; ?>
</body>
</html>
<?php
exit();
}
?>