Composer下载时出现Mismatch错误

[Composer\Downloader\TransportException]
Content-Length mismatch, received 163811 bytes out of the expected 1866130

 

解决办法

原因是 composer 的安装包网址是国外镜像所致，被长城防火墙屏蔽了。可执行以下命令来解决：
composer config -g repo.packagist composer https://packagist.phpcomposer.com

可更改安装包的全局镜像网址，然后再执行你的操作。