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sem_release — Releases the semaphore with the given ID.


bool sem_release(id);
int id: ID of semaphore to be released


TRUE on success; FALSE on failure


sem_release() releases the semaphore with the ID specified by id , which must be a valid semaphore ID as returned by sem_get() . Once released, a semaphore can no longer be used by the script; however, a new semaphore ID with the same key can be acquired and used.


PHP 3 since 3.0.6, PHP 4

See also

See also sem_acquire() , sem_get()


Example 1172. Release a semaphore


PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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