[BUGFIX] Fix several PHP 8 warnings for non admin users

Resolves: #94652
Releases: master
Change-Id: I805352b13eae98fd207ca45bbade34c489cc4c6d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70120

Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>

typo3/sysext/core/Classes/Authentication/BackendUserAuthentication.php

@@ -358,12 +358,14 @@ class BackendUserAuthentication extends AbstractUserAuthentication
                 . $GLOBALS['TCA']['pages']['ctrl']['languageField']
             );
         }
-        if ($checkRec['t3ver_oid'] > 0) {
+        if ((int)($checkRec['t3ver_oid'] ?? 0) > 0) {
             $id = (int)$checkRec['t3ver_oid'];
         }
         // if current rec is a translation then get uid from l10n_parent instead
         // because web mounts point to pages in default language and rootline returns uids of default languages
-        if ((int)$checkRec[$GLOBALS['TCA']['pages']['ctrl']['languageField']] !== 0 && (int)$checkRec[$GLOBALS['TCA']['pages']['ctrl']['transOrigPointerField']] !== 0) {
+        if ((int)($checkRec[$GLOBALS['TCA']['pages']['ctrl']['languageField'] ?? null] ?? 0) !== 0
+            && (int)($checkRec[$GLOBALS['TCA']['pages']['ctrl']['transOrigPointerField'] ?? null] ?? 0) !== 0
+        ) {
             $id = (int)$checkRec[$GLOBALS['TCA']['pages']['ctrl']['transOrigPointerField']];
         }
         if (!$readPerms) {

typo3/sysext/core/Classes/Resource/ResourceStorage.php

@@ -2727,7 +2727,7 @@ class ResourceStorage implements ResourceStorageInterface
             if (!empty($this->fileMounts[$identifier]['read_only'])) {
                 $folderRole = FolderInterface::ROLE_READONLY_MOUNT;
             }
-            if ($this->fileMounts[$identifier]['user_mount']) {
+            if ($this->fileMounts[$identifier]['user_mount'] ?? false) {
                 $folderRole = FolderInterface::ROLE_USER_MOUNT;
             }
         }

typo3/sysext/linkvalidator/Classes/Linktype/InternalLinktype.php

@@ -106,8 +106,8 @@ class InternalLinktype extends AbstractLinktype
             $this->responseContent = $this->checkContent((int)$page, (int)$anchor);
         }
         if (
-            (is_array($this->errorParams['page']) && !$this->responsePage)
-            || (is_array($this->errorParams['content']) && !$this->responseContent)
+            (is_array($this->errorParams['page'] ?? false) && !$this->responsePage)
+            || (is_array($this->errorParams['content'] ?? false) && !$this->responseContent)
         ) {
             $this->setErrorParams($this->errorParams);
         }
@@ -269,7 +269,7 @@ class InternalLinktype extends AbstractLinktype
                     );
             }
         }
-        if (is_array($errorParams['content'])) {
+        if (is_array($errorParams['content'] ?? false)) {
             switch ($errorType['content']) {
                 case self::DELETED:
                     $errorContent = str_replace(

typo3/sysext/recordlist/Classes/Controller/RecordListController.php

@@ -667,7 +667,7 @@ class RecordListController
      */
     protected function editLockPermissions(): bool
     {
-        return $this->getBackendUserAuthentication()->isAdmin() || !$this->pageInfo['editlock'];
+        return $this->getBackendUserAuthentication()->isAdmin() || !($this->pageInfo['editlock'] ?? false);
     }
 
     /**

typo3/sysext/workspaces/Classes/Hook/BackendUtilityHook.php

@@ -62,7 +62,7 @@ class BackendUtilityHook
     {
         if ($GLOBALS['BE_USER']->workspace !== 0 && BackendUtility::isTableWorkspaceEnabled($params['table'])) {
             $record = BackendUtility::getRecordWSOL($params['table'], $params['uid']);
-            if (abs($record['t3ver_stage']) > StagesService::STAGE_EDIT_ID) {
+            if (isset($record['t3ver_stage']) && abs($record['t3ver_stage']) > StagesService::STAGE_EDIT_ID) {
                 $stages = GeneralUtility::makeInstance(StagesService::class);
                 $stageName = $stages->getStageTitle($record['t3ver_stage']);
                 $editingName = $stages->getStageTitle(StagesService::STAGE_EDIT_ID);