$baseip = '256.256.256.256';
$database = $baseip.':/home/firebird/base.fdb';
$db_user = 'SYSDBA';
$db_password = 'masterke'

include('../db.php');

if (!($db=ibase_connect($database, $db_user, $db_password))) { 
		echo('<br><b>error connecting to database</b>: ' . ibase_errmsg()); 
		}	
else { 
	echo('connected!');

select SEC$USER_NAME, SEC$PLUGIN from sec$users

SQL> select SEC$USER_NAME, SEC$PLUGIN from sec$users;

SEC$USER_NAME                   SEC$PLUGIN
=============================== ===============================
SYSDBA                          Srp

SQL> select SEC$USER_NAME, SEC$PLUGIN from sec$users;

SEC$USER_NAME                   SEC$PLUGIN
=============================== ===============================
SYSDBA                          Legacy_UserManager
SYSDBA                          Srp

SQL> ALTER USER SYSDBA PASSWORD '123123' USING PLUGIN Legacy_UserManager;