PHP SSH support does not come out of the box yet. The shortest and effortless path to get it working is the following procedure.
DISCLAIMER : php-SSH is still beta and not enabled by default. Use only if you know what you’re doing!
1. Install the development components to build the module :
apt-get install php5-dev make
2. Install the dependencies :
apt-get install libssh2-1 libssh2-1-dev
3. Force the module to be installed (php-SSH is still on development) :
pecl install -f ssh2
4. Then, create the file to activate the PHP module :
vi /etc/php5/conf.d/ssh2.ini
And add :
extension=ssh2.so
5. Restart Apache to make this effective :
/etc/init.d/httpd restart