From 4faa3204d643661013b63d2cab56726df4841286 Mon Sep 17 00:00:00 2001
From: Matthew Hilton <matthewhilton@catalyst-au.net>
Date: Thu, 15 Sep 2022 08:53:31 +1000
Subject: [PATCH] MDL-73317 session: Log extra details for cachestore changes

More visibility depth is required for cachestore changes since they
are usually multi dimensional arrays.
---
 lib/classes/session/manager.php | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/classes/session/manager.php b/lib/classes/session/manager.php
index 99dd9d8aded..ca1c3c41895 100644
--- a/lib/classes/session/manager.php
+++ b/lib/classes/session/manager.php
@@ -778,6 +778,11 @@ class manager {
             $error = "Script $ME mutated the session after it was closed:";
             foreach ($arraydiff as $key => $value) {
                 $error .= ' $SESSION->' . $key;
+
+                // Extra debugging for cachestore session changes.
+                if (strpos($key, 'cachestore_') === 0 && is_array($value)) {
+                    $error .= ': ' . implode(',', array_keys($value));
+                }
             }
             debugging($error);
         }