{
    $html = '<div class="cards row" style="height:100%">';
    foreach ($friends as $friend) {
        build_friend_card($html, $friend);
    }
    $html .= '</div>';
    return $html;
}
$user = new User($_SESSION['username']);
$op = $_GET['op'];
if ($op == "create post") {
    // creates a post
    // needs post title and text
    $post;
    if (isset($_GET['file'])) {
        $post = $user->createPost_image($_GET['title'], $_GET['text'], $_GET['file']);
    } else {
        $post = $user->createPost($_GET['title'], $_GET['text']);
    }
    $html = '';
    build_post($html, $post, $user->get_username());
    $json = array('html' => $html, 'expanderid' => 'expander' . $post->get_postId(), 'commentexpanderid' => 'commentexpander' . $post->get_postId(), 'imageexpander' => 'imageexpander' . $post->get_postId(), 'replyid' => 'reply' . $post->get_postId());
    echo json_encode($json);
} else {
    if ($op == "get user images") {
        // gets all images from users posts
        $posts = $user->get_allPosts();
        $html = '';
        foreach ($posts as $post) {
            build_image_post($html, $post->get_postPath(), $post->get_title());
        }