Even if you kill() a thread, the isStarted() method will still return true.
(PECL pthreads >= 2.0.0)
Thread::isStarted — State Detection
Tell if the referenced Thread was started
Esta função não possui parâmetros.
boolean indication of state
Exemplo #1 Tell if the referenced Thread was started
$worker = new Worker();
O exemplo acima irá imprimir: