"virtPHP is a tool for creating and managing multiple isolated PHP environments on a single machine. It's like Python's virtualenv, but for PHP.

virtPHP creates isolated environments so that you may run any number of PHP development projects, all using different versions of PEAR packages and different PECL extensions. You may even specify a different version of PHP, if your system has various installations of PHP.

To install multiple versions of PHP, we suggest taking a look at the phpenv and php-build projects and using virtPHP with them, to manage multiple virtual PHP environments.

Note: virtPHP is currently only targeted to command line php (php-cli) for *nix based systems."