Initial

system/Filters/DebugToolbar.php

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+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Filters;
+
+use CodeIgniter\HTTP\RequestInterface;
+use CodeIgniter\HTTP\ResponseInterface;
+use Config\Services;
+
+/**
+ * Debug toolbar filter
+ */
+class DebugToolbar implements FilterInterface
+{
+    /**
+     * We don't need to do anything here.
+     *
+     * @param array|null $arguments
+     */
+    public function before(RequestInterface $request, $arguments = null)
+    {
+    }
+
+    /**
+     * If the debug flag is set (CI_DEBUG) then collect performance
+     * and debug information and display it in a toolbar.
+     *
+     * @param array|null $arguments
+     */
+    public function after(RequestInterface $request, ResponseInterface $response, $arguments = null)
+    {
+        Services::toolbar()->prepare($request, $response);
+    }
+}