Can't install php7 or php 7.1 with homebrew

macos homebrew php-7 macos-sierra php-7.1

PHP Snippet 1:

brew tap homebrew/dupes
brew tap homebrew/versions
brew tap homebrew/homebrew-php
brew install php71

PHP Snippet 2:

brew link [email protected] //Whatever you installed

PHP Snippet 3:

brew unlink [email protected] //Whatever is your current active version
brew link --overwrite --force [email protected] //Whatever your desired version

PHP Snippet 4:

brew unlink [email protected] && brew link --overwrite --force [email protected]