class Logger { private static $instance = null; private function __construct() { } public static function getInstance(): Logger { if (self::$instance == null) { self::$instance = new Logger(); } return self::$instance; } public function log($message) { // log message somewhere } }
\TYPO3\CMS\Core\Utility\GeneralUtility::setSingletonInstance(Logger::class, Logger::getInstance());
$customObjectManager = new MyObjectManager(); \TYPO3\CMS\Core\Utility\GeneralUtility::setSingletonInstance(TYPO3\CMS\Extbase\Object\ObjectManager::class, $customObjectManager);This will use $customObjectManager as the singleton instance of the TYPO3\CMS\Extbase\Object\ObjectManager class throughout the program. In conclusion, setSingletonInstance is a useful function in the GeneralUtility package library of TYPO3 CMS. It allows you to set a class instance or a custom instance as a singleton, ensuring that only one instance of the class is used throughout the program.