fix: exceptions for non-HTML responses

system/Debug/BaseExceptionHandler.php

@@ -268,4 +268,16 @@ protected function render(Throwable $exception, int $statusCode, $viewFile = nul
             return ob_get_clean();
         })();
     }
+
+    /**
+     * Whether the PHP display_errors setting is enabled.
+     */
+    protected function isDisplayErrorsEnabled(): bool
+    {
+        return in_array(
+            strtolower(ini_get('display_errors')),
+            ['1', 'true', 'on', 'yes'],
+            true
+        );
+    }
 }

system/Debug/ExceptionHandler.php

@@ -76,7 +76,7 @@ public function handle(
             }
 
             if (! str_contains($request->getHeaderLine('accept'), 'text/html')) {
-                $data = (ENVIRONMENT === 'development' || ENVIRONMENT === 'testing')
+                $data = $this->isDisplayErrorsEnabled()
                     ? $this->collectVars($exception, $statusCode)
                     : '';
 
@@ -134,13 +134,7 @@ protected function determineView(
         // Production environments should have a custom exception file.
         $view = 'production.php';
 
-        if (
-            in_array(
-                strtolower(ini_get('display_errors')),
-                ['1', 'true', 'on', 'yes'],
-                true
-            )
-        ) {
+        if ($this->isDisplayErrorsEnabled()) {
             $view = 'error_exception.php';
         }
 

user_guide_src/source/changelogs/v4.5.6.rst

@@ -42,6 +42,7 @@ Bugs Fixed
 - **Validation:** Fixed a bug where complex language strings were not properly handled.
 - **CURLRequest:** Added support for handling proxy responses using HTTP versions other than 1.1.
 - **Database:** Fixed a bug that caused ``Postgre\Connection::reconnect()`` method to throw an error when the connection had not yet been established.
+- **Exception:** Fixed a bug where exceptions for non-HTML responses were not relying on the PHP ``display_errors`` setting.
 
 See the repo's
 `CHANGELOG.md <https://github.com/codeigniter4/CodeIgniter4/blob/develop/CHANGELOG.md>`_