shm_remove

(PHP 4, PHP 5, PHP 7, PHP 8)

shm_remove — Removes shared memory from Unix systems

说明

shm_remove(SysvSharedMemory $shm): bool

shm_remove() removes the shared memory shm. All data will be destroyed.

参数

shm: A shared memory segment obtained from shm_attach().

返回值

成功时返回 true，或者在失败时返回 false。

更新日志

版本	说明
8.0.0	`shm` expects a SysvSharedMemory instance now; previously, a resource was expected.

参见

shm_remove_var() - Removes a variable from shared memory

add a note

User Contributed Notes 3 notes

down

aaron DURP segura DURP gmail DURP com ¶

15 years ago


It appears that you must be connected to the shm segment in order to remove it.

<?php
shm_remove($shm);
shm_detach($shm);
?>

works, while

<?php
shm_detach($shm);
shm_remove($shm);
?>

produces "Warning: shm_remove(): The parameter is not a valid shm_identifier ..."

down

HansRich ¶

8 years ago


WARNING: this function WILL NOT destroy the memory segment if there are other processes attached to it, but it will return TRUE anyways!

You will have to try to access the segment again after destroying it to make sure it was relly destroyed.

down

-1

cu at ulakbim dot gov dot tr ¶

22 years ago


Though it says **shm_identifier** in

  int shm_remove(int shm_identifier);

and

  shm_attach() returns an **id** that that can be used to access the System V...


a snippet like this:

<?php

  $key = 1234;

  $shm=shm_attach($key);

  // do whatever...

  shm_remove($shm);

?>



produces an error like

Warning: 2(which is the value of $shm) is not a existing SysV shared memory key in /usr/cu/web/sema.php on line 44...


The documentation confused me a bit. I thought shm_remove would get the shm handle/id that returns from shm_attach, not the key given to shm_attach. So, use instead:

  shm_remove($key);


which is what is intended indeed.

add a note

官方地址：https://www.php.net/manual/en/function.shm-remove.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络 JAVA NoSQL 数据库面试 C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet ADORecordSet对象 adodb手册 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 opcache预加载 Composer的Packagist资源 mysql面试题 [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式 PHP7添加redis扩展 PHP mkdir()写出来的权限与mode值不符合 Packagist / Composer 中国全量镜像支持php7的性能采集扩展 php $_SERVER中的SERVER_NAME 和HTTP_HOST的区别 adodb连接mysql多个数据库的问题

略微加速

PHP官方手册 - 互联网笔记

shm_remove

说明

参数

返回值

更新日志

参见

User Contributed Notes 3 notes