使用Composer安装Laravel报错问题

1.Your configuration does not allow connection to https://…..

禁止http：composer config -g secure-http false

2.Failed to decode response: zlib_decode(): data error

换镜像地址：composer config -g repo.packagist composer https://packagist.phpcomposer.com

3.phpunit/phpunit 5.7.1 requires ext-dom * -> the requested PHP extension dom is missing from your system.

安装PHP扩展：sudo apt-get install php-xml