posix_setgid

(PHP 3 >= 3.0.13, PHP 4, PHP 5)

posix_setgid -- Set the GID of the current process

Description

bool posix_setgid ( int gid )

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

如果成功则返回 TRUE，失败则返回 FALSE。