Protect a PHP page 加密PHP页面

$pass = "YOUR PASSWORD HERE";
$user = "YOUR USERNAME HERE";

<?php
        session_start(); //initiates the sessions
        if      ($_POST[’submit’])//checks to make sure the login form has been submitted
        {
        $pass = "YOUR PASSWORD HERE";
        $user = "YOUR USERNAME HERE";
        if      ($_POST[‘pass’] == $pass && $_POST[‘user’] == $user)//checks if the password submitted by the user matches the password stored in the $pass variable
        {
        $_SESSION[‘access’]     = 1;//if login is successful create a session that can be authenticated
        header("Location: " . $_SERVER[‘PHP_SELF’]);//reload the page. The page will now not load the login form (see the first if condition)
        }
        else// if password is incorrect reload the login form
        {
        header("Location: " . $_SERVER[‘PHP_SELF’]);
        }
        }
        else if (!$_SESSION[‘access’])//if the "access" session is not accessible show the form (not logged in)
        {?>
        <form action="<?php echo $_SERVER[’PHP_SELF’]; ?>" method="post">
        <table align="center" cellpadding="3" cellspacing="3">
        <tr>
        <td bgcolor="#F7F7F7">Username:</td>
        <td bgcolor="#F7F7F7"> <input name="user" type="text" /></td>
        </tr>
        <tr>
        <td bgcolor="#F7F7F7">Password</td>
        <td bgcolor="#F7F7F7"><input name="pass" type="text" /></td>
        </tr>
        <tr>
        <td colspan="2" bgcolor="#F7F7F7"><div align="center">
        <input name="submit" type="submit" value="Login">
        </div></td>
        </tr>
        </table>
        </form>
        <?php
        exit;
        }
        ?>

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谢谢分享。。。。。。。。