从零开始学YII2框架（一）通过Composer安装Yii2框架_php实例
最近在学习PHP，着手找一个能快速上手的框架来学习。一开始看兄弟连视频时候讲师推荐ThinkPHP。于是我选择了ThinkPHP来尝试，这个框架的上手难度系数不大，能快速开发一款应用。适合小型的企业应用。因为是国人开发的，中文支持比较好。有比较全面的文档，官网社区也比较活跃。因为我接触的项目都是用Oracle数据库的，所以我想找一款对Oracle支持比较好的PHP框架，但是ThinkPHP框架对Oracle的支持实在是不好。所以我换了Yii框架来试试对Oracle的支持程度。
Yii框架现在稳定版本是1.1.14。目前2.0是测试版。花了几天时间学习了下Yii1来创建应用。有关Yii的文档不是很多。大多都是原版英文的。但是对Oracle的支持还可以。使用的是AR技术。最近看了下Yii2的文档。它加入了PHP的命名空间概念、加入了Bootstrap、smarty等很多好用的功能。比Yii1进步很大，最后我决定学习Yii2框架。基于对Yii1的了解，Yii2应该更加出色。
今天终于搞明白怎么安装Yii2了。对于我这种小白来说真是费尽周折。下面来介绍下如何安装Composer和如何使用Composer安装Yii2。
Composer是PHP中用来管理依赖（dependency）关系的工具。你可以在自己的项目中声明所依赖的外部工具库（libraries），Composer会帮你安装这些依赖的库文件。
Windows安装Composer：
一、下载Composer
官网下载：https://getcomposer.org/download/
二、开启PHP的openssl支持
修改D:\WAMP\bin\php\php5.4.12配置文件php.ini
去掉注释；
三、安装Composer
一路"next"安装完毕。
安装完毕会提示你重新打开CMD命令行使用。
安装Yii2 - advanced 模板
一、下载yii2 - advanced 模板
官网下载：http://www.yiiframework.com/download/
下载完毕解压至
D:\WAMP\www
二、通过composer安装
打开CMD，跳转到目录
D:\WAMP\www\advanced
我们来生成一个名为“yii2test”的app。
输入命令：
composer create-project --prefer-dist --stability=dev yiisoft/yii2-app-advanced ../yii2test
等待… …出现如下界面，表示安装成功。
三、初始化项目
执行CMD命令init
测试安装结果
地址栏输入：http://localhost/yii2test/frontend/web/index.php
会看到如下界面：
至此安装Yii2完毕，后续我会跟进关于PHP框架Yii2的学习进度。
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