So if I were to create an online thing, where you register, I would do like this?
input.html
Code:
<html>
<body>
<form action="create.php" method="post">
Username: <input type="text" name="username" />
Password: <input type="text" name="password" />
<input type="submit" />
</form>
</body>
</html>
create.php
Code:
<html>
<body>
<?php echo sha1($_POST["username"] + sha1($_POST["password"])); ?>
</body>
</html>