generate_index.php

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <h1>Code Warrior Index</h1>
    <?php
    $dir = 'Exercises';

    $folders = scandir($dir, 1);
    echo '<ul>';
    foreach ($folders as $folder) {
        if (!strstr($folder, '.')) {
            $date = DateTime::createFromFormat('Y_m_d', $folder);
            echo '<li>' . $date->format('d F Y') . '</li>';
            $files = scandir($dir . '/' . $folder . '/', 1);
            foreach ($files as $file) {
                if (strlen($file) > 2) {
                    echo '<ul>';
                    echo '<li><a href="' . $dir . '/' . $folder . '/' . $file . '" target="_blank">' . $file . '</a></li>';
                    echo '</ul>';
                }
            }
        }
    }
    echo '</ul>'
    ?>
</body>

</html>