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shm_remove_var — Removes a variable from shared memory.


bool shm_remove_var(shm_id, variable_key);
int shm_id: ID of a shared memory segment
int variable_key: Key number of variable to remove


TRUE on success; FALSE on failure


shm_remove_var() removes the variable identified by variable_key from the shared memory segment identified by shm_id . FALSE is returned if variable_key is not present in the segment, or if shm_id is not a valid identifier as returned by shm_attach() .


PHP 3 since 3.0.6, PHP 4


Example 1178. Remove a variable from shared memory

if (!@shm_remove_var($shm_id, $varkey)) {
    echo "Failed to remove variable '$varkey'; reason: $php_errormsg\n";
} else {
    echo "Variable successfully removed.\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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