(PHP 4 >= 4.0.2, PHP 5, PHP 7)
posix_seteuid — Set the effective UID of the current process
$uid
) : boolSet the effective user 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.
uidThe user id.
成功时返回 TRUE， 或者在失败时返回 FALSE。