While PHP is a much older software development language it is still incredibly popular. There are many frameworks for PHP such as Cake PHP, Laravel, and many others. Ultimately PHP is a good solid language if it is used from the right applications. In addition to building out websites from scratch there are many off the shelf software platforms written in PHP that can be easily customized. CMS platforms such as WordPress, Drupal and Joomla are all built on PHP and can be easily customized if needed.
There are also a wide variety of e-commerce platforms such as Magento that can be modified by a developer to meet the exact needs of your website. While Switchbox typically builds new web applications in Ruby on Rails we still has a solid team of open source PHP developers on staff.