So, to make your lives easier, we've assembled a list of functions that are disallowed by the IPS security features on the phpfreaks server. Whenever you think you've found a function that's not in this list, and it throws a 403, try putting a space after the function name and before the parentheses. Example:
fwrite ()If it works that way, please report the function to the Moderation team via the "Report to Moderator" button, and it'll be added to the list. Please, make sure you do not submit an entry already in the list.
Now, for the list of known problem functions:
fwrite () fopen () chr () exec () system () passthru () header("Content-Le ngth: "