安装 composer 的前提要求是已经有 php 环境了；同时需要开启 openssl 和 fileinfo 扩展；
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');"
国内镜像---加速
composer config -g repo.packagist composer https://packagist.phpcomposer.com
windows 忽略
