From 98533b7e31977639ffeb03c0b64b19cee4e2398e Mon Sep 17 00:00:00 2001
From: stevekr <stevekr@users.noreply.github.com>
Date: Wed, 9 Dec 2020 13:05:26 +0200
Subject: [PATCH] Fix #18426: Fix check for route's leading slash in
 `yii\widgets\Menu`

---
 framework/CHANGELOG.md     | 1 +
 framework/widgets/Menu.php | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index 20ad74245f..aa93ce9d9e 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -12,6 +12,7 @@ Yii Framework 2 Change Log
 - Enh #18394: Add support for setting `yii\web\Response::$stream` to a callable (brandonkelly)
 - Bug #18406: Fix PDO exception when committing or rolling back an autocommitted transaction in PHP 8 (brandonkelly)
 - Bug #18287: Fix the OUTPUT got SQL syntax error if the column name is MSSQL keyword e.g key (darkdef)
+- Bug #18426: Fix check for route's leading slash in `yii\widgets\Menu` (stevekr)
 
 
 2.0.39.3 November 23, 2020
diff --git a/framework/widgets/Menu.php b/framework/widgets/Menu.php
index 6efaa7e9fd..cb9ad3e112 100644
--- a/framework/widgets/Menu.php
+++ b/framework/widgets/Menu.php
@@ -306,7 +306,7 @@ class Menu extends Widget
     {
         if (isset($item['url']) && is_array($item['url']) && isset($item['url'][0])) {
             $route = Yii::getAlias($item['url'][0]);
-            if ($route[0] !== '/' && Yii::$app->controller) {
+            if (substr($route, 0, 1) !== '/' && Yii::$app->controller) {
                 $route = Yii::$app->controller->module->getUniqueId() . '/' . $route;
             }
             if (ltrim($route, '/') !== $this->route) {