Starting in the late 90's, PHP (the language) has made staggering advancements toward offering a respectable Object-Oriented model.  The general PHP user community has slowly embraced the changes, but have not necessarily been motivated to conduct cross-paradigm migrations of existing code.  So the procedural frameworks have lived on... and gotten bigger.  But just when it seems that PHP users really have the hang of this MVC thing, SOA may breathe new life into a drooping Dupal or a tongue-tied WordPress.

PHP provides some cool bindings to the libssh2 library with an extension called ssh2.  If you are currently reading this post, you are probably already aware of this and having trouble enabling the extension in CentOS.  Don't worry, you've come to the right place.  The ssh2 extension is not usually included in a standard PHP install, and it is less than intuitive to get it up and running in CentOS.  This guide should help you out a bit.