(PHP 4 >= 4.0.2, PHP 5, PHP 7, PHP 8)
posix_seteuid — Set the effective UID of the current process
posix_seteuid(int $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_idThe user id.
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https://www.php.net/manual/en/function.posix-seteuid.php