Bir de bunu denermisiniz;
<? require_once ('../forum/index.php');?>
Alınan kodu :
Warning: require_once(../forum/index.php) [function.require-once]: failed to open stream: No such file or directory in /home2/siteadi/public_html/index.php on line 1
Fatal error: require_once() [function.require]: Failed opening required '../forum/index.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home2/siteadi/public_html/index.php on line 1