index.php

<!DOCTYPE html>
<?php
	 $username = "Reuven";
	 $password = "hackeru";
?>
<html>
<?php
	echo "Hello, ".$username;
?>

<form method="POST" >
<input type="text" placeholder="Username..." name="user" />
<input type="text" placeholder="Password..." name="pass" />
<input type="submit" value="Login!" />
</form>

<a herf="register.html">Register!</a>
<a herf="new-post.html">New Post!</a>


<?php
	if(isset($_POST['user'], $_post['pass'])) {
		if($_POST['user'] == $username && $_POST['pass'] == $password){
			echo "Success!";
		} else {
			echo "Error!";
		}
	}
?>
</html>