Originariamente inviato da goikiu
($handle = opendir('/web/htdocs/www.pippo.it/home/toc/tic/$cartella'))

metti

($handle = opendir('/web/htdocs/www.pippo.it/home/toc/tic/'.$cartella.''))
Oppure
($handle = opendir("/web/htdocs/www.pippo.it/home/toc/tic/$cartella"))