name : tutorial_lazy_initialization.php <?php require_once 'tutorial_autoload.php'; // Create a custom class implementing the singleton pattern class customSingleton { protected static $instance; public static function getInstance() { if ( self::$instance === null ) { self::$instance = new customSingleton(); ezcBaseInit::fetchConfig( 'customKey', self::$instance ); } return self::$instance; } } // Implement your configuration class class customSingletonConfiguration implements ezcBaseConfigurationInitializer { public static function configureObject( $object ) { echo "Configure customSingleton.\n"; $object->value = 42; } } // Register for lazy initilization ezcBaseInit::setCallback( 'customKey', 'customSingletonConfiguration' ); // Configure on first initilization $object = customSingleton::getInstance(); var_dump( $object->value ); ?>