From abc8b7fa2712e6df0ea94aa3106b9b9030ce0260 Mon Sep 17 00:00:00 2001
From: Jakob Johansson <jakobjohansson2@icloud.com>
Date: Sat, 7 Oct 2017 16:24:02 +0200
Subject: [PATCH] [5.5] Bail when array is provided as key in Session::flash
 (#21576)

* throw InvalidArgumentException if flash key isn't a string

* fix styling

* Update Store.php
---
 src/Illuminate/Session/Store.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Illuminate/Session/Store.php b/src/Illuminate/Session/Store.php
index be389558d383..0f4f20c9391e 100755
--- a/src/Illuminate/Session/Store.php
+++ b/src/Illuminate/Session/Store.php
@@ -337,7 +337,7 @@ public function decrement($key, $amount = 1)
      * @param  mixed   $value
      * @return void
      */
-    public function flash($key, $value = true)
+    public function flash(string $key, $value = true)
     {
         $this->put($key, $value);