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shmop_read — Reads a string of bytes from a shared memory segment.


string shmop_read(shmop_id, start, count);
int shmop_id: ID of a shared memory segment
int start: Byte offset from which to read
int count: Number of bytes to read


String from the shared memory segment; FALSE on error


shmop_read() reads and returns a string from the shared memory segment identified by shmop_id . start gives the offset in bytes from the beginning of the shared memory segment from which to start reading (starting from 0), and count gives the number of bytes to read from that point. If either of these values is out of range, or if shmop_id is not a valid identifier as returned by shmop_open() , shmop_read() returns FALSE.

In order to read all data from a segment, you can supply start and count values of 0.


PHP 4 since 4.0.3


Example 1182. Read from a shared memory segment

/* Read all of the data from a segment. */
$str = shmop_read($shm_id, 0, 0);

/* Read 50 bytes starting from byte 500. */
$str = shmop_read($shm_id, 500, 50);

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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