Untitled

<?php
$username = array('user1','user2');
$password = array ('pass1','pass2');?>

if (isset($_POST['username']) && isset($_POST['password'])) {
    // get key of posted username from $user array, will be false if not available
    if($key = array_search($_POST['username'], $user)){
        // now check the password
      if($_POST['password'] == $pass[$key]){
         $_SESSION['loggedIn'] = true;
         header('Location: success.php');
      }
    }
}

<html>
    <head>
        <title>Login Page</title>
    </head>

    <body>
        <!-- Output error message if any -->
        <?php echo $error; ?>

        <!-- form for login -->
        <form method="post" action="index.php">
            <label for="username">Username:</label><br/>
            <input type="text" name="username" id="username"><br/>
            <label for="password">Password:</label><br/>
            <input type="password" name="password" id="password"><br/>
            <input type="submit" value="Log In!">
        </form>
    </body>
</html>