Switch php versions on commandline ubuntu 16.04

Switch php versions on commandline ubuntu 16.04

# update-alternatives --set php /usr/bin/php7.1
# update-alternatives --set phar /usr/bin/phar7.1
# update-alternatives --set phar.phar /usr/bin/phar.phar7.1

Reference:

https://stackoverflow.com/questions/42619312/switch-php-versions-on-commandline-ubuntu-16-04