diff --git a/typo3/sysext/backend/Classes/Controller/LinkBrowserController.php b/typo3/sysext/backend/Classes/Controller/LinkBrowserController.php
index 4c1973bfc6fe35dad7ab260df338f5091f8c499e..ab6922ae4d3a8b5390b2f171dacc122e19b4a36e 100644
--- a/typo3/sysext/backend/Classes/Controller/LinkBrowserController.php
+++ b/typo3/sysext/backend/Classes/Controller/LinkBrowserController.php
@@ -36,6 +36,7 @@ class LinkBrowserController extends AbstractLinkBrowserController
     protected function initCurrentUrl()
     {
         $currentLink = isset($this->parameters['currentValue']) ? trim($this->parameters['currentValue']) : '';
+        /** @var array<string,string> $currentLinkParts */
         $currentLinkParts = GeneralUtility::makeInstance(TypoLinkCodecService::class)->decode($currentLink);
         $currentLinkParts['params'] = $currentLinkParts['additionalParams'];
         unset($currentLinkParts['additionalParams']);
diff --git a/typo3/sysext/core/Classes/TypoScript/Parser/ConstantConfigurationParser.php b/typo3/sysext/core/Classes/TypoScript/Parser/ConstantConfigurationParser.php
index 0f0f3effbb2573cb6f99b2488ffe39dcfbd9c01d..3c4e3918e83e223ad5a2799cf8c359cfcba103c5 100644
--- a/typo3/sysext/core/Classes/TypoScript/Parser/ConstantConfigurationParser.php
+++ b/typo3/sysext/core/Classes/TypoScript/Parser/ConstantConfigurationParser.php
@@ -92,7 +92,7 @@ class ConstantConfigurationParser
                 }
                 unset($subcatConfigurationArray);
             }
-            unset($tempConfiguration, $catConfigurationArray);
+            unset($catConfigurationArray);
             $resultArray = $hierarchicConfiguration;
         }
         return $resultArray;
diff --git a/typo3/sysext/extbase/Classes/Persistence/Generic/PropertyType.php b/typo3/sysext/extbase/Classes/Persistence/Generic/PropertyType.php
index 80ee6a7fa5e8259c1e2edf9aaacd90fe5b155c78..d4d13990555f75a12d43db2e82ffcd16976d40cf 100644
--- a/typo3/sysext/extbase/Classes/Persistence/Generic/PropertyType.php
+++ b/typo3/sysext/extbase/Classes/Persistence/Generic/PropertyType.php
@@ -185,7 +185,7 @@ class PropertyType
     /**
      * String constant for type name as used in serialization.
      */
-    const TYPENAME_WEAKREFERENCE = \WeakReference::class;
+    const TYPENAME_WEAKREFERENCE = 'WeakReference';
 
     /**
      * String constant for type name as used in serialization.
diff --git a/typo3/sysext/form/Classes/Controller/FormEditorController.php b/typo3/sysext/form/Classes/Controller/FormEditorController.php
index abfdddc071c0fdefa3516a31afe9819b154f2b02..3f7ea525e63a838efe661d63d736a009d36c8fff 100644
--- a/typo3/sysext/form/Classes/Controller/FormEditorController.php
+++ b/typo3/sysext/form/Classes/Controller/FormEditorController.php
@@ -261,6 +261,7 @@ class FormEditorController extends AbstractBackendController
      */
     protected function getInsertRenderablesPanelConfiguration(array $formElementsDefinition): array
     {
+        /** @var array<string, array<string,string>> $formElementsByGroup */
         $formElementsByGroup = [];
 
         foreach ($formElementsDefinition as $formElementName => $formElementConfiguration) {
diff --git a/typo3/sysext/indexed_search/Classes/Hook/CrawlerHook.php b/typo3/sysext/indexed_search/Classes/Hook/CrawlerHook.php
index dec2969e8490e6763301800a682f8105c04204af..1a5d86696b3d81fe7063bedd483d606b9d46065a 100644
--- a/typo3/sysext/indexed_search/Classes/Hook/CrawlerHook.php
+++ b/typo3/sysext/indexed_search/Classes/Hook/CrawlerHook.php
@@ -50,6 +50,11 @@ class CrawlerHook
      */
     public $callBack = self::class;
 
+    /**
+     * @var object
+     */
+    private $pObj;
+
     /**
      * Initialization of crawler hook.
      * This function is asked for each instance of the crawler and we must check if something is timed to happen and if so put entry(s) in the crawlers log to start processing.
@@ -59,6 +64,8 @@ class CrawlerHook
      */
     public function crawler_init(&$pObj)
     {
+        $this->pObj = $pObj;
+
         $message = null;
         // Select all indexing configuration which are waiting to be activated:
         $connection = GeneralUtility::makeInstance(ConnectionPool::class)->getConnectionForTable('index_config');
diff --git a/typo3/sysext/rte_ckeditor/Classes/Controller/BrowseLinksController.php b/typo3/sysext/rte_ckeditor/Classes/Controller/BrowseLinksController.php
index 5d08f95230102303d1ba5c8f231148a9201e5837..b0a0160ba3f08d349968b76198bc7f751d77b7b1 100644
--- a/typo3/sysext/rte_ckeditor/Classes/Controller/BrowseLinksController.php
+++ b/typo3/sysext/rte_ckeditor/Classes/Controller/BrowseLinksController.php
@@ -122,7 +122,6 @@ class BrowseLinksController extends AbstractLinkBrowserController
         $this->currentLinkParts = $queryParameters['P']['curUrl'] ?? [];
         $this->editorId = $queryParameters['editorId'];
         $this->contentsLanguage = $queryParameters['contentsLanguage'];
-        $this->RTEtsConfigParams = $queryParameters['RTEtsConfigParams'] ?? null;
 
         $this->contentLanguageService = LanguageService::create($this->contentsLanguage);