$ curl -sS https://getcomposer.org/installer | php
$ sudo mv composer.phar /usr/local/bin/composer
Make sure you have /usr/local/bin in your PATH.
$ composer global require "laravel/installer"
$ nano ~/.bash_profile
export PATH="/Users/[your_home]/.composer/vendor/bin:$PATH"
exit your terminal
$ laravel new blog
$ cd blog
$ php artisan serve --host 0.0.0.0 --port 8000