Rock, Paper, Scissors: index.php

<?php
require('required.php');
$database = new database;
if(isset($_POST["submit"])){
    $result = $_POST["game"];
    $username = (string)$_POST["username"];
    $passcode = sha1($_POST["code"]);
    $conn = $database->conn();
    $database->query($conn,$passcode,$username,$result);
}
?>
<html>
<head>
<title>Rock, Paper, Scissors</title>
</head>
<body>
<center>
<table border="0px" cellspacing="5px" cellpadding="0px">
<tr><td align="center"><h2>How this works:</h2></td></tr>
<tr><td><p>1. Type in a username to identify yourself.</p></td></tr>
<tr><td><p>2. Type in a passcode that matches your opponent's passcode.</p></td></tr>
<tr><td><p>3. Make a choice between Rock, Paper, and Scissors.</p></td></tr>
<tr><td><p>4. Click the submit button and you'll see the results of the match.</p></td></tr>
</table><br>
<form method="POST">
<table border="0px" cellspacing="5px" cellpadding="0px">
<tr><td colspan=1><label>Username: </label></td><td><input type="text" name="username" /></td></tr>
<tr><td colspan=1><label>Passcode: </label></td><td><input type="text" name="code" /></td></tr>
<tr /><tr />
<tr><td align="center"><input type="radio" name="game" value="1">Rock</input></td><td align="center"><input type="radio" name="game" value="2">Paper</input></td><td align="center"><input type="radio" name="game" value="3">Scissors</input></td></tr>
<tr /><tr />
<tr><td colspan=2 align="center"><input type="submit" name="submit" value="Submit" /></td></tr>
</table>
</form>
</center>
</body>
</html>