Unzip with exec not working

[rogair]

I'm trying to unzip a file using exec. I have a successful script that zips files, but now I am trying to unzip a file without success. I do not have zlip installed.

command:

exec('/usr/bin/unzip /tmp/filename.zip', $authorize, $ret);

I'm getting
$authorize[0] is set to Archive: /tmp/filename.zip
$authorize[n] are all empty

$ret is set to 50.

I'm really confused. I've set permissions to 777 for the file.

Thoughts, comments?

Thanks

[rogair]

SOLVED!!!

It wasn't a command problem, it was a working path problem. I had commented out a chdir() command earlier in the script because I needed to comment out an FTP session for testing. Grrr... thanks anyhoooo