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shmop_delete — Deletes a shared memory segment.


bool shmop_delete(shmop_id);
int shmop_id: ID of a shared memory segment


TRUE on success; FALSE on failure


shmop_delete() deletes the shared memory segment identified by shmop_id . If shmod_id is not a valid identifier as returned by shmop_open() , or if for some reason the segment cannot be deleted (permissions, for instance), FALSE is returned and the function fails.

Note that the segment isn't necessarily deleted immediately. Rather, it's marked for deletion, and is destroyed and its memory freed only after the last process to be attached to it has detached from it.


PHP 4 since 4.0.3


Example 1180. Delete a shared memory segment

if (!@shmop_delete($shm_id)) {
    die("Failed to delete the segment; reason: $php_errormsg\n");
} else {
    echo "Shared memory segment deleted.\n";

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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