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Mark Karpeles' Blog: PHP can do anything, what about some ssh?

Note: This article was originally published at PHPDeveloper on 29 June 2010.
PHPDeveloper

In an effort to just about everything he can with PHP Mark Karpeles has posted an article about how he created a SSH server in PHP with most (not quite all) of the functionality of some of its counterparts.

You probably know SSH at least by its name. It's a of secure telnet replacement which also allows many other things such as port forwarding, remote file management (with sftp) and more. With PHP I could write a fully working SSH server in only 3 days. [...] My goal when writing this was to provide a replacement for the FTP protocol for the customers of my hosting service.

He lists the extensions used to create the extension - OpenSSL, mcrypt, hash and (the most important) GMP as well as a link to the source if you'd like to try it out yourself.