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# CXII. Shared Memory Functions

# 介紹

Shmop is an easy to use set of functions that allows PHP to read, write, create and delete Unix shared memory segments.

> 注: 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).

> 注: In PHP 4.0.3, these functions were prefixed by shm rather than shmop.

# 需求

建立這個延伸不需要任何外部程式庫。

# 安裝

To use shmop you will need to compile PHP with the --enable-shmop parameter in your configure line.

# 執行時期組態

`php.ini`中沒有定義此延伸的組態指令。

# 資源類型

# 預先定義常數

這個延伸沒有定義任何常數。

# 範例

範例 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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