composer 安装yii2框架

    参考地址：-     http://www.yiichina.com/doc/guide/2.0/start-installation

1. 更新composer 到最新版本

  composer self-update

1. 安装composer asset plugin ，它是通过composer 管理bower 和npm 包所必须的，此命令全局生效，一劳永逸。

 composer global require "fxp/composer-asset-plugin:~1.1.1"

1. 将yii安装在名为basic的目录中

 composer create-project --prefer-dist yiisoft/yii2-app-basic basic

在这个过程中会提示你输入gitlub 的token。

token生成方式： settings –> Personal access tokens

4.安装完成后。访问：http://localhost/yii/basic/web/index.php 显示 my company 页面

---

遇到的错误

1.

Your requirements could not be resolved to an installable set of packages.  Problem 1    - yiisoft/yii2 2.0.x-dev requires bower-asset/punycode 1.3.* -> no matching package found.    - yiisoft/yii2 dev-master requires bower-asset/punycode 1.3.* -> no matching package found.    - yiisoft/yii2 2.0.9 requires bower-asset/punycode 1.3.* -> no matching package found.    - yiisoft/yii2 2.0.8 requires bower-asset/punycode 1.3.* -> no matching package found.    - yiisoft/yii2 2.0.7 requires bower-asset/punycode 1.3.* -> no matching package found.    - yiisoft/yii2 2.0.6 requires bower-asset/punycode 1.3.* -> no matching package found.    - yiisoft/yii2 2.0.5 requires bower-asset/punycode 1.3.* -> no matching package found.    - Installation request for yiisoft/yii2 >=2.0.5 -> satisfiable by yiisoft/yii2[2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9, dev-master, 2.0.x-dev].Potential causes: - A typo in the package name - The package is not available in a stable-enough version according to your minimum-stability setting   see <https://getcomposer.org/doc/04-schema.md#minimum-stability> for more details.Read <https://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.

解决方案：
百度之后发现文章 说可能是composer-asset-plugin:~1.1.1的版本太低

所以需要执行以下命令

    composer global require "fxp/composer-asset-plugin:1.2.0

 在重新安装yii，成功。

Writing lock fileGenerating autoload files> yii\composer\Installer::postCreateProjectchmod('runtime', 0777)...done.chmod('web/assets', 0777)...done.chmod('yii', 0755)...done