posix_setuid

(PHP 3>= 3.0.13, PHP 4 >= 4.0.0)

posix_setuid --  Set the effective UID of the current process

Description

bool posix_setuid (int uid)

Set the real user 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.

Returns TRUE on success, FALSE otherwise. See also posix_setgid().