CentOS7全局安装composer
1. 下载composer-setup.php到当前目录
php -r "copy('https://install.phpcomposer.com/installer', 'composer-setup.php');"
2. 安装
php composer-setup.php
3. 将composer设置成全局
mv composer.phar /usr/local/bin/composer
4. 替换成中国全量镜像
composer config -g repo.packagist composer https://packagist.phpcomposer.com