可以使用以下命令来安装：
php -r "copy('https://install.phpcomposer.com/installer', 'composer-setup.php');"php composer-setup.php
All settings correct for using Composer
Downloading...
Composer (version 1.6.5) successfully installed to: /root/composer.phar
Use it: php composer.phar移动 composer.phar，这样 composer 就可以进行全局调用：
mv composer.phar /usr/local/bin/composer
切换为国内镜像：
composer config -g repo.packagist composer https://packagist.phpcomposer.com
更新 composer：
composer selfupdate
查看composer
composer -v
标签：https,Centos,phar,composer,Linux,packagist,php From： https://www.cnblogs.com/wlei5206/p/18108998