Upgrade to php 7.1 in Ubuntu

php7.1.upgrade

accepted
There is no official PHP 7.1 in the Ubuntu 16.04 repos.

If you want PHP 7.1, there is a version available in ppa:ondrej/php

You can install it like this:

sudo add-apt-repository ppa:ondrej/php
sudo apt-get update
sudo apt-get upgrade
(optional) sudo apt-get remove php7.0
sudo apt-get install php7.1 (from comments)
Remember that this is not an official upgrade path. The PPA is well known, and is relatively safe to use.

The PPA has co-installable packages (you can have multiple versions of PHP installed from that PPA). ~muru

Is there any other way to install php7.1 on Ubuntu 16.10?
After :

sudo LC_ALL=C.UTF-8 add-apt-repository -y ppa:ondrej/php
sudo apt-get update
sudo apt-get install php

I got:

php is already the newest version (1:7.0+44). The following packages were automatically installed and are no longer required: libpcre3-dev libpcre32-3 libssl-dev libssl-doc shtool snap-confine ubuntu-core-launcher zlib1g-dev
And the current version is 7.0.18-0ubuntu0.16.10.1 (cli) ( NTS )

and after sudo apt-get install php7.1 I got the same errors:

E: Unable to locate package php7.1
E: Couldn't find any package by glob 'php7.1'
E: Couldn't find any package by regex 'php7.1'

I am having the same issue while upgrading to 7.1, not sure what is the solution to this.

I have the same issue too

Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package php7.1
E: Couldn't find any package by glob 'php7.1'
E: Couldn't find any package by regex 'php7.1'

~ » uname -a     
Linux alihossein-Lenovo-Z50-70 4.8.0-59-generic #64-Ubuntu SMP Thu Jun 29 19:38:34 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux