Is there another way to move files to another server via php? My script accepts uploads from users, and I store the uploads on my media server, so I currently have to use ftp_put to move the files after upload. The problem, is that it doesn't work very reliably with larger files (20mb+). Are there any alternatives?

PHP has bindings for cURL. That has a lot more options other than FTP and might be more stable. I use it to HTTP PUT things on the back end storage my self in a similar way you are doing. After my site receives an upload from a user it transcodes video or unzips zip files and sends them off to the other server.

Is there a quick guide on cURL usage for this purpose?

I've never used the PHP wraper.. my back end use's perl, which mostly copied the C API.

The docs on the PHP bindings are Here - http://curl.haxx.se/libcurl/php/ (http://curl.haxx.se/libcurl/php/). They also have some example scripts/apps which is where I got started originally.

Here is a very useful explanation and example on how to use cURL to put files:

http://www.jellyandcustard.com/2006/01/02/php-curl-http-put-ssl-and-basic-authentication/

If you have shell access to the server I would suggest you to use rsync instead.

Regards.