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

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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.

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

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shm_remove

说明

参数

返回值

更新日志

参见

User Contributed Notes 3 notes