Disabled functions:
0 - chgrp
1 - chown
2 - curl_init
3 - dl
4 - exec
5 - fsockopen
6 - get_current_user
7 - getmypid
8 - getmyuid
9 - getrusage
10 - leak
11 - link
12 - listen
13 - passthru
14 - pfsockopen
15 - set_time_limit
16 - tmpfile
17 - socket_create