From 957707335de345698396a2922594656b4d3e2740 Mon Sep 17 00:00:00 2001
From: Tim Otten <totten@civicrm.org>
Date: Wed, 18 Jan 2023 15:59:18 -0800
Subject: [PATCH] (dev/core#4055) ClassLoader - Use separate cache IDs for
 different configurations of modules

---
 CRM/Extension/ClassLoader.php | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/CRM/Extension/ClassLoader.php b/CRM/Extension/ClassLoader.php
index 9ca81638bf..7f84b083a9 100644
--- a/CRM/Extension/ClassLoader.php
+++ b/CRM/Extension/ClassLoader.php
@@ -179,7 +179,12 @@ class CRM_Extension_ClassLoader {
    * @return string
    */
   protected function getCacheFile() {
-    $envId = \CRM_Core_Config_Runtime::getId();
+    $envId = md5(implode(',', array_merge(
+      [\CRM_Core_Config_Runtime::getId()],
+      array_column($this->mapper->getActiveModuleFiles(), 'prefix')
+      // dev/core#4055 - When toggling ext's on systems with opcode caching, you may get stale reads for a moment.
+      // New cache key ensures new data-set.
+    )));
     $file = \Civi::paths()->getPath("[civicrm.compile]/CachedExtLoader.{$envId}.php");
     return $file;
   }
-- 
2.25.1