It is possible to install multiple versions of MySQL and PHP. But is it possible to select in DA what version will be used for a particular domain?
For example: Domain sample_a.com uses PHP 5 and MySQL 4 and domain sample_b.com uses PHP 6 and MySQL 5.
For example: Domain sample_a.com uses PHP 5 and MySQL 4 and domain sample_b.com uses PHP 6 and MySQL 5.