You may want to read through godaddy's knowledge base. Last time I've had a client with godaddy's account it was a bitch to get anything done since they purposly disable bnch of PHP functions and most of them are related to file manipulation etc. Somewhere in the knowledge base you will find a list of functions that are disabeled. You can also run phpinfo() and look for the disable_functions to see what's not available to you.
Here's something from google
"Godaddy PHP Disabled Functions (Linux): All Posix functions disabled. Also, the following functions are disabled: fpassthru, file, mail, exec, system, passthru, popen, crack_check, crack_closedict, crack_getlastmessage, crack_opendict, fsockopen, psockopen, opendir, readdir, closedir, phpinfo"
http://www.imscart.com/blog/?postid=382
http://www.nutt.net/2006/07/06/godaddy- ... functions/
http://www.vbulletin.com/forum/archive/ ... 33216.html
Good luck!
~wtf