The libvirt-php, originally called php-libvirt, is the PHP API bindings for the libvirt virtualization toolkit originally developed by Radek Hladik but currently maintained by Red Hat.
The PHP bindings code source is now maintained in a git repository available on libvirt.org:
git clone git://libvirt.org/libvirt-php.git
It can also be browsed at
http://libvirt.org/git/?p=libvirt-php.git;a=summary
Since February 2011 the project have it's own pages hosted at libvirt.org. For more information on the project please refer to http://libvirt.org/php.