$diff[$key] is an undefined index in ConfigLogPsrSubscriber.php
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #2826042. -->
Reported by: [anavarre](https://www.drupal.org/user/796160)
>>>
<p>Noticed the following errors:</p>
<pre>Notice: Undefined index: cache.page in Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->logConfigChanges() (line 63 of modules/config_log/src/EventSubscriber/ConfigLogPsrSubscriber.php).<br>Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->logConfigChanges(Object, Array, 'cache') (Line: 63)<br>Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->logConfigChanges(Object, Array) (Line: 48)<br>Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->onConfigSave(Object, 'config.save', Object) (Line: 111)<br>Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('config.save', Object) (Line: 227)<br>Drupal\Core\Config\Config->save() (Line: 180)<br>Drupal\system\Form\PerformanceForm->submitForm(Array, Object)<br>call_user_func_array(Array, Array) (Line: 111)<br>Drupal\Core\Form\FormSubmitter->executeSubmitHandlers(Array, Object) (Line: 51)<br>Drupal\Core\Form\FormSubmitter->doSubmitForm(Array, Object) (Line: 585)<br>Drupal\Core\Form\FormBuilder->processForm('system_performance_settings', Array, Object) (Line: 314)<br>Drupal\Core\Form\FormBuilder->buildForm('system_performance_settings', Object) (Line: 74)<br>Drupal\Core\Controller\FormController->getContentResult(Object, Object)<br>call_user_func_array(Array, Array) (Line: 123)<br>Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 574)<br>Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)<br>Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)<br>Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()<br>call_user_func_array(Object, Array) (Line: 139)<br>Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 62)<br>Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)<br>Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)<br>Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 99)<br>Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 78)<br>Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)<br>Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 50)<br>Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)<br>Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 656)<br>Drupal\Core\DrupalKernel->handle(Object) (Line: 19)<br>Warning: Invalid argument supplied for foreach() in Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->logConfigChanges() (line 57 of modules/config_log/src/EventSubscriber/ConfigLogPsrSubscriber.php).<br>Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->logConfigChanges(Object, NULL, 'cache.page') (Line: 63)<br>Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->logConfigChanges(Object, Array, 'cache') (Line: 63)<br>Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->logConfigChanges(Object, Array) (Line: 48)<br>Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->onConfigSave(Object, 'config.save', Object) (Line: 111)<br>Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('config.save', Object) (Line: 227)<br>Drupal\Core\Config\Config->save() (Line: 180)<br>Drupal\system\Form\PerformanceForm->submitForm(Array, Object)<br>call_user_func_array(Array, Array) (Line: 111)<br>Drupal\Core\Form\FormSubmitter->executeSubmitHandlers(Array, Object) (Line: 51)<br>Drupal\Core\Form\FormSubmitter->doSubmitForm(Array, Object) (Line: 585)<br>Drupal\Core\Form\FormBuilder->processForm('system_performance_settings', Array, Object) (Line: 314)<br>Drupal\Core\Form\FormBuilder->buildForm('system_performance_settings', Object) (Line: 74)<br>Drupal\Core\Controller\FormController->getContentResult(Object, Object)<br>call_user_func_array(Array, Array) (Line: 123)<br>Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 574)<br>Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)<br>Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)<br>Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()<br>call_user_func_array(Object, Array) (Line: 139)<br>Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 62)<br>Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)<br>Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)<br>Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 99)<br>Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 78)<br>Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)<br>Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 50)<br>Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)<br>Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 656)<br>Drupal\Core\DrupalKernel->handle(Object) (Line: 19)<br>Notice: Undefined index: cache.page in Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->logConfigChanges() (line 69 of modules/config_log/src/EventSubscriber/ConfigLogPsrSubscriber.php).<br>Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->logConfigChanges(Object, Array, 'cache') (Line: 63)<br>Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->logConfigChanges(Object, Array) (Line: 48)<br>Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->onConfigSave(Object, 'config.save', Object) (Line: 111)<br>Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('config.save', Object) (Line: 227)<br>Drupal\Core\Config\Config->save() (Line: 180)<br>Drupal\system\Form\PerformanceForm->submitForm(Array, Object)<br>call_user_func_array(Array, Array) (Line: 111)<br>Drupal\Core\Form\FormSubmitter->executeSubmitHandlers(Array, Object) (Line: 51)<br>Drupal\Core\Form\FormSubmitter->doSubmitForm(Array, Object) (Line: 585)<br>Drupal\Core\Form\FormBuilder->processForm('system_performance_settings', Array, Object) (Line: 314)<br>Drupal\Core\Form\FormBuilder->buildForm('system_performance_settings', Object) (Line: 74)<br>Drupal\Core\Controller\FormController->getContentResult(Object, Object)<br>call_user_func_array(Array, Array) (Line: 123)<br>Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 574)<br>Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)<br>Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)<br>Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()<br>call_user_func_array(Object, Array) (Line: 139)<br>Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 62)<br>Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)<br>Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)<br>Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 99)<br>Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 78)<br>Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)<br>Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 50)<br>Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)<br>Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 656)<br>Drupal\Core\DrupalKernel->handle(Object) (Line: 19)</pre><p>And:</p>
<p><code>Warning: Invalid argument supplied for foreach() in Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->logConfigChanges() (line 57 of /var/www/html/drucker/modules/config_log/src/EventSubscriber/ConfigLogPsrSubscriber.php) #0 /var/www/html/drucker/core/includes/bootstrap.inc(551): _drupal_error_handler_real(2, 'Invalid argumen...', '/var/www/html/d...', 57, Array) #1 /var/www/html/drucker/modules/config_log/src/EventSubscriber/ConfigLogPsrSubscriber.php(57): _drupal_error_handler(2, 'Invalid argumen...', '/var/www/html/d...', 57, Array) #2 /var/www/html/drucker/modules/config_log/src/EventSubscriber/ConfigLogPsrSubscriber.php(63): Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->logConfigChanges(Object(Drupal\Core\Config\Config), NULL, 'cache.page') #3 /var/www/html/drucker/modules/config_log/src/EventSubscriber/ConfigLogPsrSubscriber.php(63): Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->logConfigChanges(Object(Drupal\Core\Config\Config), Array, 'cache') #4 /var/www/html/drucker/modules/config_log/src/EventSubscriber/ConfigLogPsrSubscriber.php(48): Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->logConfigChanges(Object(Drupal\Core\Config\Config), Array) #5 /var/www/html/drucker/core/lib/Drupal/Component/EventDispatcher/ContainerAwareEventDispatcher.php(111): Drupal\config_log\EventSubscriber\ConfigLogPsrSubscriber->onConfigSave(Object(Drupal\Core\Config\ConfigCrudEvent), 'config.save', Object(Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher)) #6 /var/www/html/drucker/core/lib/Drupal/Core/Config/Config.php(227): Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('config.save', Object(Drupal\Core\Config\ConfigCrudEvent)) #7 /var/www/html/drucker/core/modules/system/src/Form/PerformanceForm.php(180): Drupal\Core\Config\Config->save() #8 [internal function]: Drupal\system\Form\PerformanceForm->submitForm(Array, Object(Drupal\Core\Form\FormState)) #9 /var/www/html/drucker/core/lib/Drupal/Core/Form/FormSubmitter.php(111): call_user_func_array(Array, Array) #10 /var/www/html/drucker/core/lib/Drupal/Core/Form/FormSubmitter.php(51): Drupal\Core\Form\FormSubmitter->executeSubmitHandlers(Array, Object(Drupal\Core\Form\FormState)) #11 /var/www/html/drucker/core/lib/Drupal/Core/Form/FormBuilder.php(585): Drupal\Core\Form\FormSubmitter->doSubmitForm(Array, Object(Drupal\Core\Form\FormState)) #12 /var/www/html/drucker/core/lib/Drupal/Core/Form/FormBuilder.php(314): Drupal\Core\Form\FormBuilder->processForm('system_performa...', Array, Object(Drupal\Core\Form\FormState)) #13 /var/www/html/drucker/core/lib/Drupal/Core/Controller/FormController.php(74): Drupal\Core\Form\FormBuilder->buildForm('system_performa...', Object(Drupal\Core\Form\FormState)) #14 [internal function]: Drupal\Core\Controller\FormController->getContentResult(Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\Core\Routing\RouteMatch)) #15 /var/www/html/drucker/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array) #16 /var/www/html/drucker/core/lib/Drupal/Core/Render/Renderer.php(574): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #17 /var/www/html/drucker/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure)) #18 /var/www/html/drucker/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) #19 [internal function]: Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #20 /var/www/html/drucker/vendor/symfony/http-kernel/HttpKernel.php(139): call_user_func_array(Object(Closure), Array) #21 /var/www/html/drucker/vendor/symfony/http-kernel/HttpKernel.php(62): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #22 /var/www/html/drucker/core/lib/Drupal/Core/StackMiddleware/Session.php(57): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #23 /var/www/html/drucker/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #24 /var/www/html/drucker/core/modules/page_cache/src/StackMiddleware/PageCache.php(99): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #25 /var/www/html/drucker/core/modules/page_cache/src/StackMiddleware/PageCache.php(78): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true) #26 /var/www/html/drucker/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(47): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #27 /var/www/html/drucker/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(50): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #28 /var/www/html/drucker/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #29 /var/www/html/drucker/core/lib/Drupal/Core/DrupalKernel.php(656): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #30 /var/www/html/drucker/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #31 {main}.</code></p>
<p>The issue is why <code>$diff[$key]</code> returning <code>NULL</code> here:</p>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br> </span><span style="color: #007700">protected function </span><span style="color: #0000BB">logConfigChanges</span><span style="color: #007700">(</span><span style="color: #0000BB">$config</span><span style="color: #007700">, </span><span style="color: #0000BB">$diff</span><span style="color: #007700">, </span><span style="color: #0000BB">$subkey </span><span style="color: #007700">= </span><span style="color: #0000BB">NULL</span><span style="color: #007700">) {<br> foreach (</span><span style="color: #0000BB">$diff </span><span style="color: #007700">as </span><span style="color: #0000BB">$key </span><span style="color: #007700">=> </span><span style="color: #0000BB">$value</span><span style="color: #007700">) {<br> if (</span><span style="color: #0000BB">$subkey</span><span style="color: #007700">) {<br> </span><span style="color: #0000BB">$key </span><span style="color: #007700">= </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">joinKey</span><span style="color: #007700">(</span><span style="color: #0000BB">$subkey</span><span style="color: #007700">, </span><span style="color: #0000BB">$key</span><span style="color: #007700">);<br> }<br><br> if (</span><span style="color: #0000BB">is_array</span><span style="color: #007700">(</span><span style="color: #0000BB">$value</span><span style="color: #007700">)) {<br> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">logConfigChanges</span><span style="color: #007700">(</span><span style="color: #0000BB">$config</span><span style="color: #007700">, </span><span style="color: #0000BB">$diff</span><span style="color: #007700">[</span><span style="color: #0000BB">$key</span><span style="color: #007700">], </span><span style="color: #0000BB">$key</span><span style="color: #007700">);<br> }<br> else {<br> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">logger</span><span style="color: #007700">-></span><span style="color: #0000BB">info</span><span style="color: #007700">(</span><span style="color: #DD0000">"Configuration changed: %key changed from %original to %value"</span><span style="color: #007700">, array(<br> </span><span style="color: #DD0000">'%key' </span><span style="color: #007700">=> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">joinKey</span><span style="color: #007700">(</span><span style="color: #0000BB">$config</span><span style="color: #007700">-></span><span style="color: #0000BB">getName</span><span style="color: #007700">(), </span><span style="color: #0000BB">$key</span><span style="color: #007700">),<br> </span><span style="color: #DD0000">'%original' </span><span style="color: #007700">=> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">format</span><span style="color: #007700">(</span><span style="color: #0000BB">$config</span><span style="color: #007700">-></span><span style="color: #0000BB">getOriginal</span><span style="color: #007700">(</span><span style="color: #0000BB">$key</span><span style="color: #007700">)),<br> </span><span style="color: #DD0000">'%value' </span><span style="color: #007700">=> </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">format</span><span style="color: #007700">(</span><span style="color: #0000BB">$value</span><span style="color: #007700">),<br> ));<br> }<br> }<br> }<br></span><span style="color: #0000BB">?></span></span></pre></div>
issue
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