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PHP: shmop - Manual
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session_write_closeShared Memory Functions
简介
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.
需求
要编译本扩展模块无需外部库文件。
安装
To use shmop you will need to compile PHP with the --enable-shmop parameter in your configure line.
运行时配置
本扩展模块在 php.ini 中未定义任何配置选项。
资源类型
预定义常量
本扩展模块未定义任何常量。
范例
Example#1 Shared Memory Operations Overview
<?php
// Create 100 byte shared memory block with system id of 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 );
?> Table of Contents
- 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
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