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https://medium.com/zenchef-tech-and-product/how-to-upgrade-your-version-of-php-to-7-0-on-macos-sierra-e1bfdea55a63

1) 
brew update && brew upgrade
brew tap homebrew/dupes
brew tap homebrew/versions
brew tap homebrew/homebrew-php
brew unlink php56 
brew install php70
You might get an error if PHP 5.6 has not been installed by brew previously, but don't worry, you can simply continue


2) # for PHP 7.1:
curl -s http://php-osx.liip.ch/install.sh | bash -s 7.1

3) Test PHP version
php -v 


4) If PHP 7 doesnt show type:
export PATH=/usr/local/php5/bin:$PATH