PHP kvuli moc znakum hazim sem

<?php
if (isset($_POST['email'])) {

// EDIT THE 2 LINES BELOW AS REQUIRED
$email_to = "info@amafix.cz";
$email_subject = "Dotaz";

function problem($error)
{
echo "We are very sorry, but there were error(s) found with the form you submitted. ";
echo "These errors appear below.<br><br>";
echo $error . "<br><br>";
echo "Please go back and fix these errors.<br><br>";
die();
}

// validation expected data exists
if (
!isset($_POST['title']) ||
!isset($_POST['email']) ||
!isset($_POST['message'])
) {
problem('We are sorry, but there appears to be a problem with the form you submitted.');
}

$name = $_POST['title']; // required
$email = $_POST['email']; // required
$message = $_POST['message']; // required

$error_message = "";
$email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';

if (!preg_match($email_exp, $email)) {
$error_message .= 'The Email address you entered does not appear to be valid.<br>';
}

$string_exp = "/^[A-Za-z .'-]+$/";

if (!preg_match($string_exp, $name)) {
$error_message .= 'The Name you entered does not appear to be valid.<br>';
}

if (strlen($message) < 2) {
$error_message .= 'The Message you entered do not appear to be valid.<br>';
}

if (strlen($error_message) > 0) {
problem($error_message);
}

$email_message = "Form details below.\n\n";

function clean_string($string)
{
$bad = array("content-type", "bcc:", "to:", "cc:", "href");
return str_replace($bad, "", $string);
}

$email_message .= "Name: " . clean_string($name) . "\n";
$email_message .= "Email: " . clean_string($email) . "\n";
$email_message .= "Message: " . clean_string($message) . "\n";

// create email headers
$headers = 'From: ' . $email . "\r\n" .
'Reply-To: ' . $email . "\r\n" .
'X-Mailer: PHP/' . phpversion();
@mail($email_to, $email_subject, $email_message, $headers);
?>

<!-- include your success message below -->

"Thank You!"

<?php
}
?>