composer.phar global require friendsofphp/php-cs-fixer

composer global require fabpot/php-cs-fixer

Then make sure you have ~/.composer/vendor/bin in your PATH and you're good to go

export PATH="$PATH:$HOME/.composer/vendor/bin"

php php-cs-fixer.phar fix /Applications/MAMP/htdocs/davidvandertuijn/app

php-cs-fixer fix /Applications/MAMP/htdocs/davidvandertuijn/app