<?php

$dirs = [
    "./playground",
    "./sample"
];

function get_pathes_recursive($dir)
{
    $result = [];
    $items = scandir($dir);
    foreach ($items as $item) {
        if ($item === '.' || $item === '..') {
            continue;
        }
        $path = $dir . DIRECTORY_SEPARATOR . $item;
        if (is_dir($path)) {
            $result = array_merge($result, get_pathes_recursive($path));
        } else {
            $result[] = $path;
        }
    }
    return $result;
}

$links = [];
foreach ($dirs as $dir) {
    $files = get_pathes_recursive($dir);
    foreach ($files as $file) {
        if (preg_match('/\.(html|php)$/', $file)) {
            $links[] = $file;
        }
    }
}
?>
<!DOCTYPE html>
<html lang="ja">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>リンク集</title>
</head>

<body>

  <h1>リンク集</h1>

  <ul>
    <?php foreach ($links as $link): ?>
    <li><a href="<?php echo htmlspecialchars($link); ?>">
        <?php echo htmlspecialchars($link); ?>
      </a></li>
    <?php endforeach; ?>
  </ul>


</body>

</html>
