From f25d5af0e179e94e7d8dd6fc9f21eca31e98f9ec Mon Sep 17 00:00:00 2001
From: memleakd <121398829+memleakd@users.noreply.github.com>
Date: Tue, 12 May 2026 22:12:29 +0200
Subject: [PATCH] fix(config): recognize disabled zlib compression values

- accept Off as a disabled zlib.output_compression value
- keep the zlib output-buffer guard active for enabled values
- update the 4.7.3 changelog

Signed-off-by: memleakd <121398829+memleakd@users.noreply.github.com>
---
 app/Config/Events.php                       | 2 +-
 user_guide_src/source/changelogs/v4.7.3.rst | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/app/Config/Events.php b/app/Config/Events.php
index 946285b89519..f360d558db45 100644
--- a/app/Config/Events.php
+++ b/app/Config/Events.php
@@ -25,7 +25,7 @@
 
 Events::on('pre_system', static function (): void {
     if (ENVIRONMENT !== 'testing') {
-        if (ini_get('zlib.output_compression')) {
+        if (! in_array(strtolower((string) ini_get('zlib.output_compression')), ['', '0', 'off'], true)) {
             throw FrameworkException::forEnabledZlibOutputCompression();
         }
 
diff --git a/user_guide_src/source/changelogs/v4.7.3.rst b/user_guide_src/source/changelogs/v4.7.3.rst
index b0eb65e687ab..6625c7ac7e5a 100644
--- a/user_guide_src/source/changelogs/v4.7.3.rst
+++ b/user_guide_src/source/changelogs/v4.7.3.rst
@@ -45,6 +45,7 @@ Bugs Fixed
 - **Database:** Fixed a bug where ``BaseConnection::listTables()`` could return a sparse array when using cached table names after a table was dropped.
 - **Database:** Fixed a bug where the PostgreSQL driver's ``increment()`` and ``decrement()`` methods were not working for numeric columns.
 - **Database:** Fixed a bug where the SQLSRV driver's decrement method was adding instead of subtracting the decrement value when ``$castTextToInt`` was false.
+- **Config:** Fixed a bug where the app starter's ``zlib.output_compression`` guard rejected the valid disabled value ``Off``.
 - **Entity:** Fixed a bug where ``Entity::normalizeValue()`` did not handle ``UnitEnum`` before checking for ``toArray()``, causing enums implementing ``toArray()`` to be incorrectly normalized as generic objects instead of enums.
 - **Kint:** Fixed a bug where stale Content Security Policy nonces were reused in worker mode, causing browser CSP violations for Debug Toolbar assets.
 - **Language:** Fixed a bug where ``Language::getLine()`` returned the literal dot-notation key instead of the nested array value when the requested key resolved to an intermediate array three or more levels deep.