I upgraded my DigitalOcean droplet today to run PHP 7, after a few hiccups this was the process that worked best for me.
1. sudo apt-get install python-software-properties
2. sudo add-apt-repository ppa:ondrej/php
3. sudo apt-get update
4. sudo apt-get update && apt-get purge php5-fpm && apt-get --purge autoremove && apt-get install php7.0-fpm php7.0-mysql php7.0 php7.0-json php7.0-curl libapache2-mod-php7.0 php7.0-opcache php7.0-xml php7.0-gd php7.0-bz2
5. sudo service apache2 restart
If you are using NGINX, swap step 5 above to:
First udate your NGINX fastcgi_pass directive to: fastcgi_pass unix:/run/php/php7.0-fpm.sock;
then restart NGINX:
sudo service nginx restart
When you are all done type in php -v and it should say you are running PHP 7.
So far I haven’t run into any issues with WordPress or the various plugins I’m running.
There is a very noticeable speed increase across the board with WordPress as well!