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<shm_attachshm_get_var>
^Semaphore FunctionsLast updated: Mon, 26 Oct 2026

shm_detach

(PHP 4, PHP 5, PHP 7, PHP 8)

shm_detach — Disconnects from shared memory segment

Description

function shm_detach(SysvSharedMemory $shm): true

shm_detach() disconnects from the shared memory given by the shm created by shm_attach(). Remember, that shared memory still exist in the Unix system and the data is still present.

Parameters

shm

A shared memory segment obtained from shm_attach().

Return Values

Always returns true.

Errors/Exceptions

Throws an Error if shm has already been detached with shm_detach().

Changelog

Version Description
8.5.0 The return type is true now; previously, it was bool.
8.0.0 shm expects a SysvSharedMemory instance now; previously, a resource was expected.

See Also


<shm_attachshm_get_var>
^Semaphore FunctionsLast updated: Mon, 26 Oct 2026