I think you should read a book about php... 😉
But I'm in a good mood, so I will help you.
Login.html
<html><head><title>Login - by Sjoerd</title></head>
<body>
<form name="log_in" method="post" action="login2.php">
Username: <input type="text" name="username"><br>
Pass: <input type="password" name="password">
</form>
</body>
</html>
login2.php
<?php
$user[0] = "Sjoerd";
$user[1] = "sgoku01";
$user[2] = "Sjoerd Rulez!!!";
$pass[0] = "pass";
$pass[1] = "word";
$pass[2] = "blah";
$x = 0;
while($x<3)
{
if( ($user[$x] == $HTTP_POST_VARS['username']) and ($pass[$x] == $HTTP_POST_VARS['password']) )
echo "YEAH BABY!! That's correct!!!";
else
echo "Grrrrr.... GO BACK!!!";
}
?>