[TASK] Fix possble php8.1 errors

Classes/Preview/PreviewRenderer.php

@@ -31,6 +31,9 @@ use TYPO3\CMS\Fluid\View\StandaloneView;
  *
  */
 class PreviewRenderer implements PreviewRendererInterface {
+
+	public const RETURNTYPE_ARR = 'array';
+
 	/**
 	 * @var LanguageService $languageService
 	 */
@@ -82,7 +85,7 @@ class PreviewRenderer implements PreviewRendererInterface {
 			'T3DataStructure'
 		)['data']['sDEF']['lDEF'];
 
-		$tabElements = GeneralUtility::trimExplode(',', $pluginConfiguration['data']['vDEF'], TRUE);
+		$tabElements = GeneralUtility::trimExplode(',', $this->passVDefOnKeyToTemplate($pluginConfiguration, 'data'), TRUE);
 		$tabs = [];
 
 		foreach ($tabElements as $tabElement) {
@@ -108,7 +111,7 @@ class PreviewRenderer implements PreviewRendererInterface {
 			];
 		}
 
-		$titles = GeneralUtility::trimExplode("\n", $pluginConfiguration['titles']['vDEF']);
+		$titles = GeneralUtility::trimExplode("\n",$this->passVDefOnKeyToTemplate($pluginConfiguration, 'titles'));
 		// Remove first item if it is empty to mimic what is actually saved to the DB and frontend behaviour.
 		// This gets done automatically on a second save of the plugin anyways but it should happen every time.
 		if ($titles[0] === '') {
@@ -116,19 +119,38 @@ class PreviewRenderer implements PreviewRendererInterface {
 		}
 
 		$templateData = [
-			'mode' => $pluginConfiguration['mode']['vDEF'],
+			'mode' => $this->passVDefOnKeyToTemplate($pluginConfiguration, 'mode'),
 			'tabs' => $tabs,
 			'titles' => $titles,
-			'enableAutoPlay' => $pluginConfiguration['enableAutoPlay']['vDEF'],
-			'autoPlayInterval' => $pluginConfiguration['autoPlayInterval']['vDEF'],
-			'enableMouseOver' => $pluginConfiguration['enableMouseOver']['vDEF'],
-			'hashName' => $pluginConfiguration['hashName']['vDEF']
+			'enableAutoPlay' => $this->passVDefOnKeyToTemplate($pluginConfiguration, 'enableAutoPlay'),
+			'autoPlayInterval' => $this->passVDefOnKeyToTemplate($pluginConfiguration, 'autoPlayInterval'),
+			'enableMouseOver' => $this->passVDefOnKeyToTemplate($pluginConfiguration, 'enableMouseOver'),
+			'hashName' => $this->passVDefOnKeyToTemplate($pluginConfiguration, 'hashName')
 		];
 
 		$view->assign('data', $templateData);
 		return $view->render();
 	}
 
+	/**
+	 * @param array $conf
+	 * @param string $key
+	 * @param string $returnType
+	 * @return array|mixed|string
+	 */
+	private function passVDefOnKeyToTemplate(array $conf, string $key, string $returnType = '') {
+		if(isset($conf[$key])) {
+			return $conf[$key]['vDEF'];
+		}
+
+		// check if we got a possible returntype:
+		if($returnType === self::RETURNTYPE_ARR) {
+			return [];
+		}
+
+		return '';
+	}
+
 	/**
 	 * Render a footer for the record to display in page module below
 	 * the body of the item's preview.