[Cryo]

This should work for the CRON method...

PHP Code:

$cthreads_SQL = "UPDATE
                    ". TABLE_PREFIX ."thread
                SET
                    open = 0
                WHERE
                    replycount > 34
                    AND open = 1";
                    
$cthreads = mysql_query($cthreads_SQL); 


If you're not including the global file you'll need to replace "TABLE_PREFIX" with your table prefix.