PHP jako value - Wersja do druku

Kod:
<?php session_start();?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

<head>

    <title>test</title>

    <meta http-equiv="content-type" content="text/html; charset=utf-8" />

    <link rel="stylesheet" href="style.css" type="text/css" />

</head>

<body>

<div id="main">

<?php

if (empty($_POST) && isset($_GET['action'])) {

        $action = $_GET['action'];

        switch ($action) {

            case 'logout':

                session_unset();

                session_destroy();

                break;

    }

}

if (!isset($_SESSION['user'])) {

    $user = '';

    $pass = '';

    if (isset($_POST['login'])) {

        $user = strtolower(trim($_POST['user']));

        $pass = $_POST['pass'];

        $errors = array();

        if ($user == '' || $user != 'admin') {

            $errors['user'] = '';

        }

        if ($pass == '' || $pass != '123456') {

            $errors['pass'] = '';

        }

        if (empty($errors)) {

            $_SESSION['user'] = $user;

        } else {

            echo '<p class="error">Please fill in your correct ';

            if (isset($errors['user']))

                echo 'username';

            if (count($errors) == 2)

                echo ' and ';

            if (isset($errors['pass']))

                echo 'password';

            echo '.</p>', "\n";

        }

    }

}

if (isset($_SESSION['user'])) {

    $user = $_SESSION['user'];

?>

<div id="headertext">

    <p class="l">You are logged in as <strong><?php echo $user?></strong>.</p>

    <p class="r"><a href="?action=logout">Logout</a></p>

</div>

<?php

    if (isset($_POST['edit'])) {

        if (file_put_contents('../index.php', $_POST['homecontent']))

            echo '<p class="succes">Your changes are saved.</p>', "\n";

    }

    $homecontent = file_get_contents('../index.php');

?>

<form method="post" action="">

    <p>Here you can edit your homepage text:</p>

    <textarea name="homecontent" id="homecontent" rows="20" cols="55"><?php echo $homecontent?></textarea>

    <p><button type="submit" name="edit">Save changes</button></p>

    <button onclick="document.getElementById('homecontent').value='<?PHP include(\'strony/gora.txt\');?>';">DOdaj</button>

?>

</form>

<?php } else {?>



<form method="post" action="" id="login">

    <p>

        <label for="user">Username:</label><input type="text" name="user" id="user" value="<?php echo $user?>" />

    </p>

    <p>

        <label for="pass">Password:</label><input type="password" name="pass" id="pass" value="<?php echo $pass?>" />

    </p>

    <p>

        <button type="submit" name="login">Login</button>

    </p>

</form>

<?php }?>

</div>

</body>

</html>