一、Windows安装Composer
需要开启 openssl 配置：打开 php 目录下的 php.ini，将 extension=php_openssl.dll 前面的分号去掉就可以了。
https://getcomposer.org/Composer-Setup.exe
下载打开：
1、查看安装
Win+R-->cmd-->composer
出现以下即表示已安装
2、将composer换成国内镜像
composer config -g repo.packagist composer https://packagist.phpcomposer.com
若是国外镜像，运行composer global require psy/psysh会一直显示Changed current directory to C:/Users/Administrator/AppData/Roaming/Composer
二、Composer安装PsySH
1、安装
composer global require psy/psysh
2、运行
可在安装位置C:\Users\Administrator\AppData\Roaming\Composer查看
将C:\Users\Administrator\AppData\Roaming\Composer\vendor\bin加入系统环境变量PATH
三、Composer安装Thinkphp5
composer create-project topthink/think tp5 --prefer-dist //tp5为项目名称
四、Composer 安装PHPUnit
composer global require phpunit/phpunit // 全局安装在c盘
composer require --dev phpunit/phpunit // 或者在项目根目录安装
另外：Centos安装Composer
# php -r "copy('https://install.phpcomposer.com/installer', 'composer-setup.php');"
# php composer-setup.php
//移动 composer.phar，这样 composer 就可以进行全局调用
# mv composer.phar /usr/local/bin/composer # echo "export PATH=$PATH:/usr/local/bin" >> /etc/bashrc # source /etc/bashrc # composer -v
//切换为国内镜像,出现黄色警告不影响操作
# composer config -g repo.packagist composer https://packagist.phpcomposer.com
//记得时常更新 composer
# composer selfupdate