https://www.php.net/manual/it/thread.isstarted.php
PHP: Thread::isStarted - Manual
phpthreadmanual
https://www.php.net/manual/ja/fiber.isstarted.php
PHP: Fiber::isStarted - Manual
phpfibermanual
https://www.php.net/manual/pt_BR/fiber.isstarted.php
PHP: Fiber::isStarted - Manual
Determina se uma Fiber foi iniciada
phpfibermanual