CentOS7にComposerをインストールする ref: http://qiita.com/inakadegaebal/items/d370bcb1627fce2b5cd1

file0.txt

# php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"

file1.txt

# php -r "if (hash_file('SHA384', 'composer-setup.php') === '55d6ead61b29c7bdee5cccfb50076874187bd9f21f65d8991d46ec5cc90518f447387fb9f76ebae1fbbacf329e583e30') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"

file2.txt

# php composer-setup.php

file3.txt

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

file4.txt

# mv composer.phar /usr/local/bin/composer

file5.txt

$ composer