php man page for posix_seteuid

POSIX_SETEUID(3)							 1							  POSIX_SETEUID(3)

posix_seteuid - Set the effective UID of the current process

SYNOPSIS
       bool posix_seteuid (int	$uid)

DESCRIPTION
	Set  the  real 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.

PARAMETERS
	      o $uid
		- The user id.

RETURN VALUES
	Returns TRUE on success or FALSE on failure.

SEE ALSO
       posix_setgid(3).

PHP Documentation Group 													  POSIX_SETEUID(3)