wget https://mirrors.aliyun.com/composer/composer.phar
或者：curl -sS https://getcomposer.org/installer | php
配置只在当前项目生效：
composer config repo.packagist composer https://mirrors.aliyun.com/composer
配置在全局性生效：
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer
composer config -g repo.packagist composer https://developer.aliyun.com/composer
composer config -g repos.packagist composer https://mirrors.cloud.tencent.com/composer
chmod -R 777 ./composer.phar
mv composer.phar /usr/local/bin/composer
查看源：
composer config -g -l
取消当前项目配置：
composer config --unset repos.packagist
取消全局配置：
composer config -g --unset repos.packagist
项目配置：
composer config repo.packagist composer https://mirrors.aliyun.com/composer/
更新Composer:
composer self-update
阿里云镜像 https://mirrors.aliyun.com/composer/
腾讯云镜像 https://mirrors.cloud.tencent.com/composer/
华为云镜像 https://repo.huaweicloud.com/repository/php/
wget https://mirrors.cloud.tencent.com/composer/composer.phar
wget https://getcomposer.org/installer/1.6.5/composer.phar
mv composer.phar /usr/local/bin/composer
composer -V
useradd xiongfeng
passwd xiongfeng
设置密码xfxfxf
su xiongfeng
composer -V
composer install
