sem_remove Remove a semaphore boolsem_remove intsem_identifier Returns: &true; on success, &false; on error. sem_remove removes the semaphore sem_identifier if it has been created by sem_get, otherwise generates a warning. After removing the semaphore, it is no more accessible. See also: sem_get, sem_release and sem_acquire. This function does not work on Windows systems. It was added on PHP 4.1.0.