(PHP 4 >= 4.1.0, PHP 5, PHP 7)
sem_remove — Remove a semaphore
$sem_identifier
sem_remove() removes the given semaphore.
After removing the semaphore, it is no longer accessible.
sem_identifier
A semaphore resource identifier as returned by sem_get().
成功时返回 TRUE， 或者在失败时返回 FALSE。
TRUE
FALSE