if(!$_POST['name'] || strlen($_POST['name'])<3 || strlen($_POST['name'])>50)
{
$errors['name']='Please fill in a valid name!<br />Must be between 3 and 50 characters.';
}
This is a little presumptuous. "Sorry, people with 2- and 51-letter names."
The title is misleading. This page has nothing to do with carbon fiber.
Pity the HTML is so bad in this tutorial. A site that purports to be authoritative (at least enough to be providing tutorials) should know how to use HTML properly.
I love how this site provides workable backend code using PHP. It makes the demos really fun to use, and the tutorials become more engaging.