Install PHP Composer

php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php -r "if (hash_file('SHA384', 'composer-setup.php') === '669656bab3166a7aff8a7506b8cb2d1c292f042046c5a994c43155c0be6190fa0355160742ab2e1c88d40d5be660b410') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;"
php composer-setup.php
php -r "unlink('composer-setup.php');"

if desired move (or use install arg) to put binary into path, e.g., mv composer.phar /usr/local/bin/composer

see: https://getcomposer.org/download/
and: https://getcomposer.org/doc/00-intro.md#installation-linux-unix-osx

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