1.
curl -sS https://getcomposer.org/installer | php
mv composer.phar /usr/local/bin/composer
chmod -R 777 /usr/local/bin/composer # 修改权限,否则执行的时候会报错
2.
useradd -d /home/admin -m admin
passwd admin #
usermod -a -G root admin
vi /etc/profile
PATH=/home/admin/.composer/vendor/bin:$PATH
source /etc/profile
3.
su admin
composer -V # 查看版本
4.全局配置（推荐）
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
5.取消配置
composer config -g --unset repos.packagist
6.Composer版本升级到最新
composer self-update
签名：这个人很懒，什么也没有留下！
