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http://mac.thetutorialfree.com/2016/09/14/how-to-install-php-composer-on-mac-os-x-10-12-sierra/


1) in the home Directory or whatever directory you might be currently in
sudo php -r "copy('http://getcomposer.org/installer', 'composer-setup.php');"

1a) if error about sudoers file:
  sudo php -r "if (hash_file('SHA384', 'composer-setup.php') === 'e115a8dc7871f15d853148a7fbac7da27d6c0030b848d9b3dc09e2a0388afed865e6a3d6b3c0fad45c48e2b5fc1196ae') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"


2) 
sudo php composer-setup.php


3)
sudo php -r "unlink('composer-setup.php');"


4) now move from the composer.phar from the current directory to the composer directory
sudo mv composer.phar /usr/local/bin/composer


5)
composer -V


6)  To fix the bullshit permissions error
sudo chown -R $USER $HOME/.composer