Yii2未能与composer一起创建新项目

Warning: This development build of composer is over 30 days old. It is recommended to update it by running "composer.phar self-update" to get the latest version.
  [Composer'Downloader'TransportException]                                                      
  The "https://packagist.org/packages.json" file could not be downloaded: Failed to enable crypto  
  failed to open stream: operation failed                                                       

create-project [-s|--stability="..."] [--prefer-source] [--prefer-dist] [--repository-url="..."] [--dev] [--no-dev] [--no-plugins] [--no-custom-installers] [--no-scripts] [--no-progress] [--keep-vcs] [--no-install] [package] [directory] [version]     

  [Composer'Downloader'TransportException]                                                      
  The "https://getcomposer.org/version" file could not be downloaded: Failed to enable crypto  
  failed to open stream: operation failed                                                       
self-update

Yii2安装

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（1）首次安装Composer（LINUX）：

本地：

卷曲-sShttps://getcomposer.org/installer|php

php-r"readfile（'https://getcomposer.org/installer'）；"|php

卷曲-sShttps://getcomposer.org/installer|php----install dir=bin

或

全球：

卷曲-sShttps://getcomposer.org/installer|php

mv composer.phar/usr/local/bin/composer

（1）首次安装Composer（WINDOWS）：

C:''Users''username>cd C:''bin

C:''bin>php-r"readfile（'https://getcomposer.org/installer'）；"|php

注意：如果由于读取文件而导致上述操作失败，请使用http url或在php.ini 中启用php_opensl.dll

C:''bin>echo@php"%~dp0composer.phar"%>composer.bat*

C:''Users''username>composer-V作曲家版本27d8904

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（2）Yii2框架在线下载：

基本应用程序： php composer.phar创建项目yiisoft/yii2应用程序基本2.0.0-beta

高级应用程序： php composer.phar创建yiisoft/yii2应用程序高级2.0.0-beta项目

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（3）其他应用程序设置命令：

php-init

注意：设置DB Cofig common/config/local-main.php

php-yii-migrate

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参考：

http://stuff.cebe.cc/yii2docs/guide-start-installation.html

https://github.com/yiisoft/yii2/tree/master/apps/advanced