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CXXI. Shared Memory Functions
Shmop is an easy to use set of functions that allows PHP to read,
write, create and delete Unix shared memory segments.
Note:
Versions of Windows previous to Windows 2000 do not support shared memory.
Under Windows, Shmop will only work when PHP is running as a web server
module, such as Apache or IIS (CLI and CGI will not work).
Note:
In PHP 4.0.3, these functions were prefixed by shm
rather than shmop.
No external libraries are needed to build this extension.
To use shmop you will need to compile PHP with the
--enable-shmop parameter in your
configure line.
This extension has no configuration directives defined in php.ini. This extension has no constants defined.
Example 1. Shared Memory Operations Overview
<?php
// Create 100 byte shared memory block with system id if 0xff3
$shm_id = shmop_open(0xff3, "c", 0644, 100);
if (!$shm_id) {
echo "Couldn't create shared memory segment\n";
}
// Get shared memory block's size
$shm_size = shmop_size($shm_id);
echo "SHM Block Size: " . $shm_size . " has been created.\n";
// Lets write a test string into shared memory
$shm_bytes_written = shmop_write($shm_id, "my shared memory block", 0);
if ($shm_bytes_written != strlen("my shared memory block")) {
echo "Couldn't write the entire length of data\n";
}
// Now lets read the string back
$my_string = shmop_read($shm_id, 0, $shm_size);
if (!$my_string) {
echo "Couldn't read from shared memory block\n";
}
echo "The data inside shared memory was: " . $my_string . "\n";
//Now lets delete the block and close the shared memory segment
if (!shmop_delete($shm_id)) {
echo "Couldn't mark shared memory block for deletion.";
}
shmop_close($shm_id);
?>
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Copyright © 1997 - 2007 by the PHP Documentation Group. This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later. A copy of the Open Publication License is distributed with this manual, the latest version is presently available at http://www.opencontent.org/openpub/.
Please see full copyright text at http://www.php.net/manual/en/copyright.php
Original version of the above documentation is available at http://www.php.net/manual/en/
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