在多层(3层架构模式)中放置带有缓存文件的文件夹的位置?

Where to put folder in cached files in multitier architecture?Also i have a class playlistBL.class.php which deals with getting videos from youtube in xml format and then sending them to videos.php page as an array so videos php page can loop through it and show videos,is it correct to put that playlistBL.class.php in modules_BL/playlist/playlistBl.class.php or is it better to put it in separate folder videos??

videos.php //file location is in root

    <?php
    if(session_id() === "")
    {
        session_start();
    }
    require_once "modules_BL/user/loginBL.class.php";
    require_once "modules_BL/album/albumBL.class.php";
    include_once "modules_BL/playlist/playlistBL.class.php";

?>
<!DOCTYPE html>
<html>
    <head>
    <meta charset="UTF-8">
        <title>View Our Videos</title>
    <link href="https://fonts.googleapis.com/css?family=Metal+Mania" rel="stylesheet">
    <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.3.1/css/all.css" integrity="sha384-mzrmE5qonljUremFsqc01SB46JvROS7bZs3IO2EmfFsd15uHvIt+Y8vEf7N7fWAU" crossorigin="anonymous">
    <link href="css/style.css" type="text/css" rel="stylesheet">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script src="js/hide.js"></script>
    </head>
    <body>
        <div id="wrapper">
            <header id="header">
                <a href="index.html">
                    <img src="images/prisoner_logo.jpg" alt="prisoner_logo.jpg">
                </a>    
            </header> <!-- end of #header -->

            <nav id="nav">
                <ul>
                    <li><a href="index.html">Prison</a></li>
                    <li><a href="biography.html">Biography</a></li>
                    <li><a href="discography.html">Discography</a></li>
                    <li><a href="merchandize.php">Merchandize</a></li>
                    <li><a href="contact.html">Contact</a></li>
                </ul>
            </nav> <!-- end of #navigation -->

            <main id="main" class="view">
                <section id="bckToOpt">
                    <div>
                        <button type="submit" name="bckToOpt"><a href="home.php" class="btnStyle">Back to Options</a></button>
                    </div>
                </section>

            <?php
                $loginBL = new LoginBL();
                $loginBL->CheckUserSessionData();
                $user = unserialize($_SESSION["user"]);

                if($user->GetID_ROLA() == USER_ROLE_KORISNIK)
                {
                    $playlist = new PlaylistBL();
                    $contents = $playlist->WatchVideos();

                    foreach ($contents as $content)
                    {
                        echo $content;
                    }
                }


            ?>
            <section class="bckToTop">
                <div>
                    <button type="submit" name="bckToTop"><a href="#bckToOpt" class="btnStyle">Back to Top</a></button>
                </div>
            </section>

            </main> <!-- end of #main -->

            <footer id="footer">
                <p>Offical Prisoner WebSite &copy; 2018</p>
            </footer>
        </div> <!-- end of #wrapper -->
    </body>
</html>

playlistBl.class.php //file location is in modules_BL/playlist/

<?php

class PlaylistBL
{
    public function WatchVideos()
    {
            $feed = "https://www.youtube.com/feeds/videos.xml?playlist_id=PLDuBTz2Byh9MaprT9RPIzkGWsUJCYrMKe";
            $xml = simplexml_load_file($feed);
            $entries = $xml->entry;

            foreach($entries as $entry)
            {
                $published = $entry->published;
                $shortDate = date("d.m.Y", strtotime($published));

                $title = $entry->title;
                $id = $entry->id;
                $id = str_replace("yt:video:", "", $id);
                $author = $entry->author->name;
                $uri = $entry->author->uri;

                $content = sprintf("<article class='iframeContainer'>
                                        <h1><a class='btnStyle' href='%s'>%s</a></h1>
                                        <iframe src='%s%s' class='iframeSize' allowfullscreen>
                                        </iframe>
                                        <br>
                                        <small>Published: %s &nbsp; By: %s</small>
                                    </article>
                                    <hr>
                                    ",
                                        $uri,
                                        $title,
                                        "http://www.youtube.com/embed/",
                                        $id,
                                        $shortDate,
                                        $author
                                    );
                $contentArray[] = $content;
            }

            return $contentArray;
    }
}

?>

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