Mac 安装Composer

Step 1

终端执行：

curl -sS https://getcomposer.org/installer | php

Step 2

echo $PATH 

输出：usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin

mv composer.phar /sur/local/bin/composer

Step 3 (换国内镜像)

composer config -g repo.packagist composer https://packagist.phpcomposer.com

phpcomposer有些项目要提示输入账号密码，可以换其他国内镜像
https://packagist.laravel-china.org