diff --git a/typo3/sysext/backend/Classes/Controller/EditDocumentController.php b/typo3/sysext/backend/Classes/Controller/EditDocumentController.php
index f8a1c98f31cf..d77cf1bc8c09 100644
--- a/typo3/sysext/backend/Classes/Controller/EditDocumentController.php
+++ b/typo3/sysext/backend/Classes/Controller/EditDocumentController.php
@@ -1197,7 +1197,7 @@ protected function makeEditForm(): string
                                 $this->errorC++;
                                 // Try to fetch error message from "recordInternals" be user object
                                 // @todo: This construct should be logged and localized and de-uglified
-                                $message = (!empty($beUser->errorMsg)) ? $beUser->errorMsg : $message = $e->getMessage() . ' ' . $e->getCode();
+                                $message = (!empty($beUser->errorMsg)) ? $beUser->errorMsg : $e->getMessage() . ' ' . $e->getCode();
                                 $title = $this->getLanguageService()
                                     ->sL('LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:labels.noEditPermission');
                                 $editForm .= $this->getInfobox($message, $title);
diff --git a/typo3/sysext/backend/Classes/Form/Element/SelectSingleElement.php b/typo3/sysext/backend/Classes/Form/Element/SelectSingleElement.php
index 1e6d447c05f8..13c9fe5c8564 100644
--- a/typo3/sysext/backend/Classes/Form/Element/SelectSingleElement.php
+++ b/typo3/sysext/backend/Classes/Form/Element/SelectSingleElement.php
@@ -76,7 +76,6 @@ public function render()
 
         $table = $this->data['tableName'];
         $field = $this->data['fieldName'];
-        $row = $this->data['databaseRow'];
         $parameterArray = $this->data['parameterArray'];
         $config = $parameterArray['fieldConf']['config'];
 
diff --git a/typo3/sysext/backend/Classes/Form/FieldControl/EditPopup.php b/typo3/sysext/backend/Classes/Form/FieldControl/EditPopup.php
index 849b47b4d3d8..c0224871c51c 100644
--- a/typo3/sysext/backend/Classes/Form/FieldControl/EditPopup.php
+++ b/typo3/sysext/backend/Classes/Form/FieldControl/EditPopup.php
@@ -19,7 +19,6 @@
 
 use TYPO3\CMS\Backend\Form\AbstractNode;
 use TYPO3\CMS\Backend\Routing\UriBuilder;
-use TYPO3\CMS\Core\Localization\LanguageService;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
 use TYPO3\CMS\Core\Utility\StringUtility;
 
@@ -36,7 +35,6 @@ class EditPopup extends AbstractNode
      */
     public function render()
     {
-        $languageService = $this->getLanguageService();
         $options = $this->data['renderData']['fieldControlOptions'];
 
         $title = $options['title'] ?? 'LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:labels.edit';
@@ -100,14 +98,4 @@ public function render()
             ],
         ];
     }
-
-    /**
-     * Returns an instance of LanguageService
-     *
-     * @return LanguageService
-     */
-    protected function getLanguageService()
-    {
-        return $GLOBALS['LANG'];
-    }
 }
diff --git a/typo3/sysext/backend/Classes/Tree/View/ElementBrowserPageTreeView.php b/typo3/sysext/backend/Classes/Tree/View/ElementBrowserPageTreeView.php
index 5e4a533ce118..d2d611b0cfc2 100644
--- a/typo3/sysext/backend/Classes/Tree/View/ElementBrowserPageTreeView.php
+++ b/typo3/sysext/backend/Classes/Tree/View/ElementBrowserPageTreeView.php
@@ -167,13 +167,12 @@ public function ext_isLinkable($doktype, $uid)
      *
      * @param string $icon HTML string to wrap, probably an image tag.
      * @param string $cmd Command for 'PM' get var
-     * @param string $bMark If set, the link will have an anchor point (=$bMark) and a name attribute (=$bMark)
+     * @param string $bMark If set, the link will have a name attribute (=$bMark)
      * @param bool $isOpen
      * @return string Link-wrapped input string
      */
     public function PM_ATagWrap($icon, $cmd, $bMark = '', $isOpen = false)
     {
-        $anchor = $bMark ? '#' . $bMark : '';
         $name = $bMark ? ' name=' . $bMark : '';
         $urlParameters = $this->linkParameterProvider->getUrlParameters([]);
         $urlParameters['PM'] = $cmd;
diff --git a/typo3/sysext/core/Classes/Authentication/AbstractUserAuthentication.php b/typo3/sysext/core/Classes/Authentication/AbstractUserAuthentication.php
index 57e096800c9f..d9c44116412c 100644
--- a/typo3/sysext/core/Classes/Authentication/AbstractUserAuthentication.php
+++ b/typo3/sysext/core/Classes/Authentication/AbstractUserAuthentication.php
@@ -428,7 +428,6 @@ protected function setSessionCookie()
         $isSetSessionCookie = $this->isSetSessionCookie();
         $isRefreshTimeBasedCookie = $this->isRefreshTimeBasedCookie();
         if ($isSetSessionCookie || $isRefreshTimeBasedCookie) {
-            $settings = $GLOBALS['TYPO3_CONF_VARS']['SYS'];
             // Get the domain to be used for the cookie (if any):
             $cookieDomain = $this->getCookieDomain();
             // If no cookie domain is set, use the base path:
diff --git a/typo3/sysext/core/Classes/Authentication/AuthenticationService.php b/typo3/sysext/core/Classes/Authentication/AuthenticationService.php
index 5d5e0175477d..ddbf9b0aa9fc 100644
--- a/typo3/sysext/core/Classes/Authentication/AuthenticationService.php
+++ b/typo3/sysext/core/Classes/Authentication/AuthenticationService.php
@@ -118,10 +118,9 @@ public function authUser(array $user): int
         $saltFactory = GeneralUtility::makeInstance(PasswordHashFactory::class);
 
         // Get a hashed password instance for the hash stored in db of this user
-        $invalidPasswordHashException = null;
         try {
             $hashInstance = $saltFactory->get($passwordHashInDatabase, $this->pObj->loginType);
-        } catch (InvalidPasswordHashException $invalidPasswordHashException) {
+        } catch (InvalidPasswordHashException $exception) {
             // Could not find a responsible hash algorithm for given password. This is unusual since other
             // authentication services would usually be called before this one with higher priority. We thus log
             // the failed login but still return '100' to proceed with other services that may follow.
diff --git a/typo3/sysext/core/Classes/DependencyInjection/ContainerBuilder.php b/typo3/sysext/core/Classes/DependencyInjection/ContainerBuilder.php
index 7e465b977f9b..8df0e0ae494d 100644
--- a/typo3/sysext/core/Classes/DependencyInjection/ContainerBuilder.php
+++ b/typo3/sysext/core/Classes/DependencyInjection/ContainerBuilder.php
@@ -74,8 +74,6 @@ public function createDependencyInjectionContainer(PackageManager $packageManage
             return new FailsafeContainer($serviceProviderRegistry, $this->defaultServices);
         }
 
-        $container = null;
-
         $cacheIdentifier = $this->getCacheIdentifier($packageManager);
         $containerClassName = $cacheIdentifier;
 
diff --git a/typo3/sysext/core/Classes/Domain/Repository/PageRepository.php b/typo3/sysext/core/Classes/Domain/Repository/PageRepository.php
index 7b6919e03cb7..20b3b714118a 100644
--- a/typo3/sysext/core/Classes/Domain/Repository/PageRepository.php
+++ b/typo3/sysext/core/Classes/Domain/Repository/PageRepository.php
@@ -1487,7 +1487,6 @@ public function fixVersioningPid($table, &$rr)
             return;
         }
         $uid = (int)$rr['uid'];
-        $oid = 0;
         $workspaceId = 0;
         $versionState = null;
         // Check values for t3ver_state and t3ver_wsid
diff --git a/typo3/sysext/core/Classes/Resource/ResourceStorage.php b/typo3/sysext/core/Classes/Resource/ResourceStorage.php
index 02c6d9f08308..f4a7c1130238 100644
--- a/typo3/sysext/core/Classes/Resource/ResourceStorage.php
+++ b/typo3/sysext/core/Classes/Resource/ResourceStorage.php
@@ -2188,10 +2188,8 @@ protected function getAllFileObjectsInFolder(Folder $folder)
     public function moveFolder(Folder $folderToMove, Folder $targetParentFolder, $newFolderName = null, $conflictMode = DuplicationBehavior::RENAME)
     {
         // @todo add tests
-        $originalFolder = $folderToMove->getParentFolder();
         $this->assureFolderMovePermissions($folderToMove, $targetParentFolder);
         $sourceStorage = $folderToMove->getStorage();
-        $returnObject = null;
         $sanitizedNewFolderName = $this->driver->sanitizeFileName($newFolderName ?: $folderToMove->getName());
         // @todo check if folder already exists in $targetParentFolder, handle this conflict then
         $this->eventDispatcher->dispatch(
@@ -2321,7 +2319,6 @@ public function renameFolder($folderObject, $newName)
         }
 
         $sanitizedNewName = $this->driver->sanitizeFileName($newName);
-        $returnObject = null;
         if ($this->driver->folderExistsInFolder($sanitizedNewName, $folderObject->getIdentifier())) {
             throw new \InvalidArgumentException('The folder ' . $sanitizedNewName . ' already exists in folder ' . $folderObject->getIdentifier(), 1325418870);
         }
diff --git a/typo3/sysext/core/Classes/Resource/StorageRepository.php b/typo3/sysext/core/Classes/Resource/StorageRepository.php
index c1b45f81e781..47c86e8a0927 100644
--- a/typo3/sysext/core/Classes/Resource/StorageRepository.php
+++ b/typo3/sysext/core/Classes/Resource/StorageRepository.php
@@ -337,7 +337,6 @@ public function getStorageObject($uid, array $recordData = [], &$fileIdentifier
         }
         if (empty($this->storageInstances[$uid])) {
             $storageConfiguration = null;
-            $storageObject = null;
             /** @var BeforeResourceStorageInitializationEvent $event */
             $event = $this->eventDispatcher->dispatch(new BeforeResourceStorageInitializationEvent($uid, $recordData, $fileIdentifier));
             $recordData = $event->getRecord();
diff --git a/typo3/sysext/extbase/Classes/Persistence/Generic/Storage/Typo3DbQueryParser.php b/typo3/sysext/extbase/Classes/Persistence/Generic/Storage/Typo3DbQueryParser.php
index c419427ab1db..4edcc5172e02 100644
--- a/typo3/sysext/extbase/Classes/Persistence/Generic/Storage/Typo3DbQueryParser.php
+++ b/typo3/sysext/extbase/Classes/Persistence/Generic/Storage/Typo3DbQueryParser.php
@@ -769,7 +769,7 @@ protected function getFrontendConstraintStatement($tableName, $ignoreEnableField
         if ($ignoreEnableFields && !$includeDeleted) {
             if (!empty($enableFieldsToBeIgnored)) {
                 // array_combine() is necessary because of the way \TYPO3\CMS\Core\Domain\Repository\PageRepository::enableFields() is implemented
-                $statement .= $this->getPageRepository()->enableFields($tableName, -1, array_combine($enableFieldsToBeIgnored, $enableFieldsToBeIgnored), true);
+                $statement .= $this->getPageRepository()->enableFields($tableName, -1, array_combine($enableFieldsToBeIgnored, $enableFieldsToBeIgnored));
             } elseif (!empty($GLOBALS['TCA'][$tableName]['ctrl']['delete'])) {
                 $statement .= ' AND ' . $tableName . '.' . $GLOBALS['TCA'][$tableName]['ctrl']['delete'] . '=0';
             }
diff --git a/typo3/sysext/filelist/Classes/FileList.php b/typo3/sysext/filelist/Classes/FileList.php
index bba7522617d4..296912226d3d 100644
--- a/typo3/sysext/filelist/Classes/FileList.php
+++ b/typo3/sysext/filelist/Classes/FileList.php
@@ -1040,7 +1040,7 @@ public function makeEdit($fileOrFolderObject)
         // replace file
         if ($fileOrFolderObject instanceof File && $fileOrFolderObject->checkActionPermission('replace')) {
             $attributes = [
-                'href' => $url = (string)$this->uriBuilder->buildUriFromRoute('file_replace', ['target' => $fullIdentifier, 'uid' => $fileOrFolderObject->getUid(), 'returnUrl' => $this->listURL()]),
+                'href' => (string)$this->uriBuilder->buildUriFromRoute('file_replace', ['target' => $fullIdentifier, 'uid' => $fileOrFolderObject->getUid(), 'returnUrl' => $this->listURL()]),
                 'title' => $this->getLanguageService()->sL('LLL:EXT:core/Resources/Private/Language/locallang_core.xlf:cm.replace'),
             ];
             $cells['replace'] = '<a class="btn btn-default" ' . GeneralUtility::implodeAttributes($attributes, true) . '>' . $this->iconFactory->getIcon('actions-edit-replace', Icon::SIZE_SMALL)->render() . '</a>';
diff --git a/typo3/sysext/form/Classes/Controller/FormManagerController.php b/typo3/sysext/form/Classes/Controller/FormManagerController.php
index e20ccacedcba..b1ca58e03e20 100644
--- a/typo3/sysext/form/Classes/Controller/FormManagerController.php
+++ b/typo3/sysext/form/Classes/Controller/FormManagerController.php
@@ -460,7 +460,6 @@ protected function registerDocheaderButtons()
         $buttonBar = $this->view->getModuleTemplate()->getDocHeaderComponent()->getButtonBar();
         $currentRequest = $this->request;
         $moduleName = $currentRequest->getPluginName();
-        $getVars = $this->request->getArguments();
 
         // Create new
         $addFormButton = $buttonBar->makeLinkButton()
diff --git a/typo3/sysext/form/Classes/ViewHelpers/RenderFormValueViewHelper.php b/typo3/sysext/form/Classes/ViewHelpers/RenderFormValueViewHelper.php
index 52325e17d838..84527e294871 100644
--- a/typo3/sysext/form/Classes/ViewHelpers/RenderFormValueViewHelper.php
+++ b/typo3/sysext/form/Classes/ViewHelpers/RenderFormValueViewHelper.php
@@ -177,8 +177,6 @@ public static function mapValueToOption($value, array $options)
      */
     public static function processObject(FormElementInterface $element, $object): string
     {
-        $properties = $element->getProperties();
-
         if ($element instanceof StringableFormElementInterface) {
             return $element->valueToString($object);
         }
diff --git a/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php b/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php
index 1a75b3f4b540..96ab80d71e68 100644
--- a/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php
+++ b/typo3/sysext/frontend/Classes/ContentObject/ContentObjectRenderer.php
@@ -4547,8 +4547,6 @@ public function getKey($key, $arr)
      */
     protected function resolveMixedLinkParameter($linkText, $mixedLinkParameter, &$configuration = [])
     {
-        $linkParameter = null;
-
         // Link parameter value = first part
         $linkParameterParts = GeneralUtility::makeInstance(TypoLinkCodecService::class)->decode($mixedLinkParameter);
 
@@ -4560,7 +4558,6 @@ protected function resolveMixedLinkParameter($linkText, $mixedLinkParameter, &$c
             // Disallow insecure scheme's like javascript: or data:
             return $linkText;
         }
-        $linkParameter = $linkParameterParts['url'];
 
         // additional parameters that need to be set
         if ($linkParameterParts['additionalParams'] !== '') {
@@ -4570,7 +4567,7 @@ protected function resolveMixedLinkParameter($linkText, $mixedLinkParameter, &$c
         }
 
         return [
-            'href'   => $linkParameter,
+            'href'   => $linkParameterParts['url'],
             'target' => $linkParameterParts['target'],
             'class'  => $linkParameterParts['class'],
             'title'  => $linkParameterParts['title']
diff --git a/typo3/sysext/frontend/Classes/Middleware/PreviewSimulator.php b/typo3/sysext/frontend/Classes/Middleware/PreviewSimulator.php
index a7481eddda91..bf8a0d63231a 100644
--- a/typo3/sysext/frontend/Classes/Middleware/PreviewSimulator.php
+++ b/typo3/sysext/frontend/Classes/Middleware/PreviewSimulator.php
@@ -80,7 +80,6 @@ public function process(ServerRequestInterface $request, RequestHandlerInterface
      */
     protected function simulateDate(ServerRequestInterface $request): bool
     {
-        $simulatedDate = null;
         $queryTime = $request->getQueryParams()['ADMCMD_simTime'] ?? false;
         if (!$queryTime) {
             return false;
diff --git a/typo3/sysext/impexp/Classes/Import.php b/typo3/sysext/impexp/Classes/Import.php
index 1f1d470a54b2..ae2d26ac33cc 100644
--- a/typo3/sysext/impexp/Classes/Import.php
+++ b/typo3/sysext/impexp/Classes/Import.php
@@ -1414,7 +1414,7 @@ public function processSoftReferences_substTokens($tokenizedContent, $softRefCfg
      */
     public function processSoftReferences_saveFile($relFileName, $cfg, $table, $uid)
     {
-        if ($fileHeaderInfo = $this->dat['header']['files'][$cfg['file_ID']]) {
+        if ($this->dat['header']['files'][$cfg['file_ID']]) {
             // Initialize; Get directory prefix for file and find possible RTE filename
             $dirPrefix = PathUtility::dirname($relFileName) . '/';
             if (GeneralUtility::isFirstPartOfStr($dirPrefix, $this->fileadminFolderName . '/')) {
diff --git a/typo3/sysext/tstemplate/Classes/Controller/TypoScriptTemplateInformationModuleFunctionController.php b/typo3/sysext/tstemplate/Classes/Controller/TypoScriptTemplateInformationModuleFunctionController.php
index 9cd62f98af87..86f078121c30 100644
--- a/typo3/sysext/tstemplate/Classes/Controller/TypoScriptTemplateInformationModuleFunctionController.php
+++ b/typo3/sysext/tstemplate/Classes/Controller/TypoScriptTemplateInformationModuleFunctionController.php
@@ -157,7 +157,6 @@ public function main()
             $url = (string)$uriBuilder->buildUriFromRoute('web_ts', $urlParameters);
             HttpUtility::redirect($url);
         }
-        $tce = null;
         if ($existTemplate) {
             $lang = $this->getLanguageService();
             $lang->includeLLFile('EXT:tstemplate/Resources/Private/Language/locallang_info.xlf');