(no version information, might be only in CVS)
fbsql_change_user -- 
     Change logged in user of the active connection
    
Description
resource 
fbsql_change_user ( string user, string password [, string database [, resource link_identifier]])
 
     fbsql_change_user() changes the logged in user
     of the current active connection, or the connection given by the
     optional parameter link_identifier.  If a database is specified,
     this will default or current database after the user has been
     changed.  If the new user and password authorization fails, the
     current connected user stays active.