CXXXVI. Shared Memory Functions

簡介

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

要編譯本增加模組無需外部庫檔案。

安裝

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

運行時配置

本增加模組在 php.ini 中未定義任何配置選項。

資源類型

預定義常量

本增加模組未定義任何常量。

範例

例子 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); ?>

目錄
shmop_close -- Close shared memory block
shmop_delete -- Delete shared memory block
shmop_open -- Create or open shared memory block
shmop_read -- Read data from shared memory block
shmop_size -- Get size of shared memory block
shmop_write -- Write data into shared memory block