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sem_release	shm_attach

Semaphore Functions	Last updated: Mon, 26 Oct 2026

sem_remove

(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)

sem_remove — Remove a semaphore

Description

function sem_remove(SysvSemaphore $semaphore): bool

sem_remove() removes the given semaphore.

After removing the semaphore, it is no longer accessible.

Parameters

semaphore: A semaphore as returned by sem_get().

Return Values

Returns true on success or false on failure.

Changelog

Version	Description
8.0.0	`semaphore` expects a SysvSemaphore instance now; previously, a resource was expected.

See Also

sem_get() - Get a semaphore id
sem_release() - Release a semaphore
sem_acquire() - Acquire a semaphore

sem_release	shm_attach

Semaphore Functions	Last updated: Mon, 26 Oct 2026