diff --git a/public/docker_index.php b/public/docker_index.php
index d1e574e..268c1c2 100644
--- a/public/docker_index.php
+++ b/public/docker_index.php
@@ -1,16 +1,35 @@
 <?php
 
 $dirs = [
-    "./playground/",
-    "./sample/"
+    "./playground",
+    "./sample"
 ];
 
-// 直下のhtml phpファイルを取得
+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) {
-    $files = glob($dir . "**/*.{html,php}", GLOB_BRACE);
+    $files = get_pathes_recursive($dir);
     foreach ($files as $file) {
-        $links[] = $file;
+        if (preg_match('/\.(html|php)$/', $file)) {
+            $links[] = $file;
+        }
     }
 }
 ?>
@@ -35,6 +54,8 @@
     <?php endforeach; ?>
   </ul>
 
+<?php print_r($links); ?>
+
 </body>
 
 </html>