Drupal VM defaults to PHP 7.1, but you can also install and use 5.6 or 7.1.

Ubuntu

Ondřej Surý's PPA for PHP is used to install PHP 7.1, but you can switch to using 5.6 or 7.0 packages by changing php_version inside config.yml to "5.6" or "7.0".

If you're using Apache with mod_php you should also add libapache2-mod-php5.6 or libapache2-mod-php7.0 to the extra_packages list.

Note: XHProf does currently not work with PHP 7.1, make sure you don't have it listed in installed_extras.

RedHat/CentOS 7

Remi's RPM repository is included with Drupal VM, and you can make the following changes to use it to install PHP 7.0 or PHP 5.6 instead of 7.1:

  1. Make sure you've followed the directions for switching to CentOS 7 in the use a different base OS guide.
  2. Change php_version inside config.yml to "5.6" or "7.0".