# posix_setuid

(PHP 4, PHP 5, PHP 7)

posix_setuid — Set the UID of the current process

### 说明

posix_setuid ( int `$uid` ) : bool

Set the real user ID of the current process. This is a privileged function that needs appropriate privileges (usually root) on the system to be able to perform this function.

### 参数

`uid`

  The user id.

### 返回值

成功时返回 `TRUE`， 或者在失败时返回 `FALSE`。

### 范例

Example #1 posix_setuid() example

This example will show the current user id and then set it to a different value.

    <?php
    echo posix_getuid()."\n"; //10001
    echo posix_geteuid()."\n"; //10001
    posix_setuid(10000);
    echo posix_getuid()."\n"; //10000
    echo posix_geteuid()."\n"; //10000
    ?>

### 参见

- posix_setgid() - Set the GID of the current process
- posix_seteuid() - Set the effective UID of the current process
- posix_getuid() - Return the real user ID of the current process
- posix_geteuid() - Return the effective user ID of the current process