Secured PHP Contact Form
<?php
if(isset($_POST['submit'])){
$name = htmlspecialchars(stripslashes(trim($_POST['name'])));
$subject = htmlspecialchars(stripslashes(trim($_POST['subject'])));
$email = htmlspecialchars(stripslashes(trim($_POST['email'])));
$message = htmlspecialchars(stripslashes(trim($_POST['message'])));
if(!preg_match("/^[A-Za-z .'-]+$/", $name)){