Step 1
sudo apt-get install software-properties-common sudo add-apt-repository ppa:ondrej/php sudo apt-get update
Note: There might be some errors as follows after running sudo apt-get update:
Reading package lists... Done W: GPG error: http://ppa.launchpad.net/ondrej/php/ubuntu xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 4F4EA0AAE5267A6C W: The repository 'http://ppa.launchpad.net/ondrej/php/ubuntu xenial InRelease' is not signed. N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use. N: See apt-secure(8) manpage for repository creation and user configuration details.
This can be fixed by running the following command:
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 4F4EA0AAE5267A6C
Then run sudo apt-get update again. The error messages should disappear.
Step 2
sudo apt-get install php7.1
sudo apt-get install php7.1 php7.1-cli php7.1-common php7.1-json php7.1-opcache php7.1-mysql php7.1-mbstring php7.1-mcrypt php7.1-zip php7.1-fpm
php -v
If there are multiple versions of PHP installed, use the following command to switch between versions:
update-alternatives --config php
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