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(PHP 4 >= 4.0.2, PHP 5, PHP 7, PHP 8)
posix_seteuid — Set the effective UID of the current process
$user_id): bool
Set 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.
user_id
The user id.
成功时返回 true， 或者在失败时返回 false。
