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1. 创建一个项目，参看

http://blog.csdn.net/terry_water/article/details/50477023

2.git的操作命令

http://blog.csdn.net/terry_water/article/details/48177371

3.更新composer.json

其中name 和github一致，type必须写yii2-extension

source 是github的地址

minimum-stability 的 值：stable 代表下载稳定版本号

require 是依赖

autoload 是加入文件：/vendor/composer/autoload_psr4.php ，在这个文件中会加入一行：

'terry\\' => array($vendorDir . '/zqy234/logtest'),

{  "name": "zqy234/logtest",  "description": "Yii2 zqy234 test",  "keywords": [    "yii2",    "logtest"  ],  "homepage": "https://github.com/zqy234/logtest",  "type": "yii2-extension",  "license": "MIT",  "support": {    "source": "https://github.com/zqy234/logtest"  },  "authors": [    {      "name": "terry water",      "email": "zqy234@126.com"    }  ],  "minimum-stability": "stable",  "require": {    "php": ">=5.4.0",    "yiisoft/yii2": ">=2.0.6"     },  "autoload": {    "psr-4": {      "terry\\": ""    }  },  "config": {    "process-timeout": 1800  }}

composer require --prefer-dist zqy234/logtest

[root@iZ942k2d5ezZ fancyecommerce.com]# composer require --prefer-dist zqy234/logtestUsing version ^1.0 for zqy234/logtest./composer.json has been updatedLoading composer repositories with package informationUpdating dependencies (including require-dev)  - Installing zqy234/logtest (1.0.0)                        Downloading: 100%         Writing lock fileGenerating autoload files[root@iZ942k2d5ezZ fancyecommerce.com]#

'zqy234/logtest' =>  array (    'name' => 'zqy234/logtest',    'version' => '1.0.0.0',    'alias' =>    array (      '@terry' => $vendorDir . '/zqy234/logtest',    ),  ),

参考：https://github.com/yiisoft/yii2/blob/master/docs/guide/structure-extensions.md