What is PhpDig?
PhpDig is a PHP MySQL based
Web Spider & Search Engine.

shmop_read
Prev	LVII. Semaphore and Shared Memory Functions	Next

shmop_read

Name

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

Synopsis

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

Returns

String from the shared memory segment; FALSE on error

Description

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.

Version

PHP 4 since 4.0.3

Example

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);

Prev	Home	Next
shmop_open	Up	shmop_size

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 http://www.opencontent.org/openpub/). The authors of this book have elected not to choose any options under the OPL. This online book was obtained from http://www.fooassociates.com/phpfer/ 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.