### 切換阿里鏡像
```
composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
```
2.composer切換 阿里鏡像 原文地址 https://developer.aliyun.com/composer
全局配置 :composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/
composer config -gl 查看全局配置
\[repositories.packagist.org.url\] https://mirrors.aliyun.com/composer/ --成功
3.安裝laravel5.6
環境 windows phpstudy8 php7.3.4
以composer來安裝laravel 5.6 前提已安裝composer
打開cmd-> composer create-project --prefer-dist laravel/laravel=5.6.\* blog

### 出錯原因是 以前的低版本composer 更新時有緩存
composer clearcache
清除緩存OK
```
https://www.cnblogs.com/xfych/p/13446401.html
```