# posix_setgid

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

posix_setgid — Set the GID of the current process

### 说明

posix_setgid(int `$group_id`): bool

Set the real group ID of the current process. This is a privileged function and needs appropriate privileges (usually root) on the system to be able to perform this function. The appropriate order of function calls is posix_setgid() first, posix_setuid() last.

> 注意:

> If the caller is a super user, this will also set the effective group id.

### 参数

`group_id`

  The group id.

### 返回值

成功时返回 `true`， 或者在失败时返回 `false`。

### 示例

示例 #1 posix_setgid() example

This example will print out the effective group id, once it is changed.

`<?php
echo 'My real group id is '.posix_getgid(); //20
posix_setgid(40);
echo 'My real group id is '.posix_getgid(); //40
echo 'My effective group id is '.posix_getegid(); //40
?>`

### 参见

- posix_getgrgid() - Return info about a group by group id
- posix_getgid() - Return the real group ID of the current process

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