Untitled

<!doctype html>
<html lang="de">
<head>

    <!-- Einbindung Stylesheet-->

    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">


    <link rel="stylesheet" type="text/css" href="style/style_index.css" />
    <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.6.3/css/all.css" integrity="sha384-UHRtZLI+pbxtHCWp1t77Bi1L4ZtiqrqD80Kn4Z8NTSRyMA2Fd33n5dQ8lWUE00s/" crossorigin="anonymous">
    <link href="https://fonts.googleapis.com/css?family=Montserrat" rel="stylesheet">
    <link href="https://fonts.googleapis.com/css?family=Pacifico" rel="stylesheet">
    <meta charset="utf-8">
    <title>ally</title>
</head>
<body>
<?php
session_start();
$logged_user = $_SESSION['username'];
?>
<div id="header">
    <div id="header_content">
        <div id="logo">ally</div>
        <div id="navigation">
            <ul>
                <?php
                if (isset($logged_user)) {
                    include_once('./functions/posts/search_form.php');
                    echo "<li><a href='index.php'><i class='fas fa-home'></i> Startseite</a></li>";
                    echo "<li><a href='?page=users&action=logout'><i class=\"fas fa-sign-out-alt\"></i> Logout</a></li>";
                    echo "<li><a href='?page=posts&action=create'><i class=\"fas fa-plus\"></i> Neuer Beitrag</a></li>";
                    echo "<li><a href='?page=profile&user=$logged_user'><i class=\"fas fa-user\"></i> Mein Profil</a></li>";
                }
                ?>
                <!--<li><a href="?page=users&action=registrierung">Registrierung</a></li>-->
            </ul>
        </div>
    </div>

</div>

<div id="content">
<?php
if (isset($_GET['q'])){ //suche, get-> dass man NUR den findet, den man sucht
    include('./functions/posts/search_do.php');
}elseif (!isset($logged_user)) {
    switch ($_GET["page"]) {
        case"users":
            include "./functions/users/index.php";
            break;
        default:
            include"./functions/users/login_form.php";
    }
}else {
    switch ($_GET["page"]){
        case"users":
            include "./functions/users/index.php";
            break;
        case"posts":
            include "./functions/posts/index.php";
            break;
        case"profile":
            include "./functions/profil/index.php";
            break;
        case"search": //suche
            include "./functions/posts/search_do.php";
            break;
        default:
            include"./functions/posts/view.php";
    }
}
?>
</div>
</body>
</html>