SftpConnecter for Porter.
Be careful if you use Libssh2
When trying to use STFP commands once logged in the server, a segmentation fault can happen if you're not using the good version on PHP/Ssh2. There is a supposedly working hack to avoid that (casting the resource to an int when using the SSH2 wrapper but it never worked for me).
/!\ Use it at your own risk /!\