On DevShed today, there's a new tutorial on showing how to create a simple application to use one of the simpler protocols - FTP.
PHP has many functions that help us to implement Internet and/or networking protocols. In this article, we will look at how to implement some of those protocols using PHP.
They introduce the FTP functions for PHP (a basic list, PHP manual style) and include the code - the CSS to make it easier to use and the PHP code to make the FTP connection and grab the remote file listing. A screenshot is included to give you an idea of the end result.