CentOS下Composer的安装和使用

1. 下载composer.phar
   curl -sS https://getcomposer.org/installer | php
2. 把composer.phar移动到环境下让其变成可执行
   mv composer.phar /usr/local/bin/composer
3. 测试
   composer -V
   *若出现command not found 增加/usr/local/bin进PATH
4. 换中国镜像
   composer config -g repo.packagist composer https://packagist.phpcomposer.com

composer安装laravel5.5
http://www.dahouduan.com/2017/09/05/composer-install-laravel55/

https://www.cnblogs.com/zouzhe0/p/7146706.html