Notes FE

if(!preg_match("/^[a-zA-z ]*$/",$_POST['name']);
if(!preg_match("/^[0-9]{4}+$/",$_POST['year']);

$matrixLength = strlen($_POST['matrix']);

if($matrixLength>12 || $matrixLength<12)

<?php echo $_SERVER['PHP_SELF'];?>

$name = filter_var($_POST['name'],FILTER_SANITIZE_STRING);
else if(!filter_var($_POST['email'], FILTER_VALIDATE_EMAIL))

SESSION_START();
$_SESSION['name'] = $name;
SESSION_END();

$dob = preg_replace("([^0-9-])", "", $_POST['dob']);

<link href="css/bootstrap.min.css" rel="stylesheet">
<script src="js/bootstrap.min.js"></script>

form-group, form-inline, form-control

placeholder, required