First install Brew on your MAC
- Setup Brew:
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" brew updatebrew tap homebrew/dupesbrew tap homebrew/php- Install PHP 7.1.+
brew install php71 --with-postgresql - Install
mcrypt:brew install mcrypt php71-mcrypt - Finally, install composer:
brew install composer