ComposerDownloaderTransportException ... Failed to enable crypto，failed to open stream: operation failed

failed to open stream: operation failed

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错误详细信息：

[ComposerDownloaderTransportException] 
The "https://packagist.laravel-china.org/packages.json" file could not be downloaded: Peer certificate CN=`*.phphub.org' did not match expected CN=`packagist.laravel-china.org'
Failed to enable crypto 
failed to open stream: operation failed

[ComposerDownloaderTransportException]
  Content-Length mismatch, received 3444 bytes out of the expected 299952

错误发生情境：

　　使用 composer require 命令下载软件时。

解决办法：

　　（1）更换composer镜像源，可以执行尝试以下几种：

　　　　更换成阿里镜像：composer config -g repo.packagist composer https://mirrors.aliyun.com/composer/

　　　　更换成Laravel China镜像： composer config -g repo.packagist composer https://packagist.laravel-china.org

　　　　更换成中国全量镜像：composer config -g repo.packagist composer https://packagist.phpcomposer.com

　　（2）如果更换镜像，还不能下载成功，可能是网络有问题：

　　　　　　1、（虚拟机环境）可以尝试把静态ip更换为动态获取，桥接改为网络地址转换。

　　　　　　2、通过ftp或文件共享方式下载然后上传。

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