download composer exe code example
Example 1: install composer mac
curl -sS https://getcomposer.org/installer | php
php composer.phar install
mv composer.phar /usr/local/bin/composer
open -e ~/.zshrc
// or open -e ~/.bash_profile
alias composer="php /usr/local/bin/composer"
Example 2: where do you install composer
// Adding permissions after installing Composer on Mac OSX
sudo chmod 755 /usr/local/bin/composer.phar