CodeIgniter 框架 主要知识点 （一）
CI框架是轻便灵活的一种框架，没有很多的束缚，他也有自己封装的方法，不过这个框架使用原生的PHP语法写起来更加爽，不像其他框架，用的时间长了，慢慢的连基本的PHP语法都忘了。
应用流程：
index.php 文件作为前端控制器，初始化运行 CodeIgniter 所需的基本资源；Router 检查 HTTP 请求，以确定如何处理该请求；如果存在缓存文件，将直接输出到浏览器，不用走下面正常的系统流程；在加载应用程序控制器之前，对 HTTP 请求以及任何用户提交的数据进行安全检查；控制器加载模型、核心类库、辅助函数以及其他所有处理请求所需的资源；最后一步，渲染视图并发送至浏览器，如果开启了缓存，视图被会先缓存起来用于 后续的请求。
用于检查文件是否存在。
启用查询字符串:此模块提供了一个基于正则表达式分析器的重写引擎来实时重写URL请求。它支持每个完整规则可以拥有不限数量的子规则以及附加条件规则的灵活而且强大的URL操作机制。此URL操作可以依赖于各种测试，比如服务器变量、环境变量、HTTP头、时间标记，甚至各种格式的用于匹配URL组成部分的查找数据库。此模块可以操作URL的所有部分(包括路径信息部分)，在服务器级的(httpd.conf)和目录级的(.htaccess)配置都有效，还可以生成最终请求字符串。此重写操作的结果可以是内部子处理，也可以是外部请求的转向，甚至还可以是内部代理处理。一般mod_rewrite默认是不启动的，这时我们需要手动启用它。
index.php?c=products&m=view&id=345
CodeIgniter 也支持这个格式，你可以在 application/config.php 配置文件中启用它。打开你的配置文件，查找下面这几项:
$config['enable_query_strings'] = FALSE;$config['controller_trigger'] = 'c';$config['function_trigger'] = 'm';
index.php?c=controller&m=method
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