#88 Add instructions for switching PHP versions

Author: Daryl Lozupone

FAQ.md

@@ -55,6 +55,19 @@ If you cannot create a `scripts/` directory in the same directory as your `Vagra
 `wplib-scripts/` — and then search for `scripts/` in your `Vagrantfile` and replace it with whatever you named your directory, e.g. 
 with `wplib-scripts/` as in our example.
 
+## How do I switch PHP versions?
+The PHP version in use by the site is set in the Nginx vhost configuration. Our intention is to provide a control panel to simplify this process, but currently
+you must edit this file manually. This file is located at `/etc/nginx/sites-available/default`.
+To change to PHP 7, you must change the line `set $sock php5.6-fpm.sock;` to `set $sock php7.0-fpm.sock;`.
+This can be accomplished by connecting to the guest machine via ssh:
+
+    cd project-directory
+    vagrant ssh
+    sudo nano /etc/nginx/sites-available/default
+    
+Change the pertinent line. Press `CTRL-X` to exit the program. When prompted to save the buffer, press `ENTER`. The filename will appear. Press `ENTER` again. Then enter the command `sudo service nginx restart`.
+Visit [http://wplib.box/phpinfo.php](http://wplib.box/phpinfo.php) (or whatever domain name you have configured for the box) to verify.
+
 ##Glossary: What Do They All These Terms Mean?
 The following are terms we have decide to use in our FAQ and in other documents.  If any of these terms conflict with broader industry terms please submit a pull request with any suggested corrects. 
 

README.md

@@ -20,7 +20,7 @@ We think that once you try WPLib Box you will agree that we have succeeded.  Wan
 
 Service/Software|Version
 -------|----------
-PHP/PHP5-FPM|5.6.20
+PHP-FPM|5.6.20 && 7.0
 MySQL|5.5
 nginx|1.4
 XDEBUG|2.3.3
@@ -92,6 +92,11 @@ To something else that is compatible with your network, i.e. maybe:
 
 We will probably change to a different default IP address in the future.
 
+## Switching PHP Versions
+
+The box has both PHP-FPM 5.6 and 7.0 running concurrently. They are implemented as separate processes with
+individual sockets. Instructions on how to select which version to use can be found in the [FAQ](https://github.com/wplib/wplib-box/blob/master/FAQ.md).
+
 ## Logging into the WordPress Admin
 
 To login to [wplib.box/wp-admin/](http://wplib.box/wp-admin) use the following credentials: