Upgrade Cloud9 IDE to PHP7

Run the following command in Bash:

wget https://raw.githubusercontent.com/imanseau/Cloud9-PHP7-Upgrade/master/cloud9-php7-upgrade.sh
sudo chmod +x cloud9-php7-upgrade.sh
./cloud9-php7-upgrade.sh

Then press <Enter> and Y, then <Enter>.

Source:

https://github.com/imanseau/Cloud9-PHP7-Upgrade