Modify website to support new sub-folders architecture

website/channels.php

@@ -15,11 +15,19 @@
         }
     }
 
+    function str_replace_first($needle, $replace, $haystack) {
+        $pos = strpos($haystack, $needle);
+        if ($pos !== false) {
+            $haystack = substr_replace($haystack, $replace, $pos, strlen($needle));
+        }
+        return $haystack;
+    }
+
     $uri = $_SERVER['REQUEST_URI'];
     $uri = str_replace('/channels/', '', $uri);
     $prefix = '/mnt/HDD0/YouTube_captions_search_engine/channels/';
     if (str_contains($uri, '/')) {
-        $uri = str_replace('/', '#', $uri);
+        $uri = str_replace_first('/', '#', $uri);
         $uri = $prefix . $uri;
         if (str_ends_with($uri, '.json')) {
             header('Content-Type: application/json; charset=UTF-8');