php man page for posix_setuid

POSIX_SETUID(3) 							 1							   POSIX_SETUID(3)

posix_setuid - Set the UID of the current process

SYNOPSIS
       bool posix_setuid (int  $uid)

DESCRIPTION
	Set  the real user ID of the current process. This is a privileged function that 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.

EXAMPLES
       Example #1

	      posix_setuid(3) example

	      This example will show the current user id and then set it to a different value.

	      <?php
	      echo posix_getuid()."
"; //10001
	      echo posix_geteuid()."
"; //10001
	      posix_setuid(10000);
	      echo posix_getuid()."
"; //10000
	      echo posix_geteuid()."
"; //10000
	      ?>

SEE ALSO
       posix_setgid(3), posix_seteuid(3), posix_getuid(3), posix_geteuid(3).

PHP Documentation Group 													   POSIX_SETUID(3)