从fuel cms来研究ci框架

首先fuel cms是基于CI的，都是单一入口

在本地localhost目录下面有index.php和.htaccess

index.php 是定义一些基础常量，然后载入fuel/codeigniter/core/CodeIgniter.php文件，这个文件就是单一入口，先寻找路由（默认控制器类为page_router 方法index），然后通过Output类来显示（分为有缓存和无缓存两种方式） 这个单一文件基本上概括了整站的架构

再来看一下.htaccess文件

Options +FollowSymLinks
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /

<Files .*>
    Order Deny,Allow
    Deny From All
</Files>

# Allow asset folders through
RewriteRule ^(fuel/modules/(.+)?/assets/(.+)) - [L]

# Protect application and system files from being viewed
RewriteRule ^(fuel/install/.+|fuel/crons/.+|fuel/data_backup/.+|fuel/codeigniter/.+|fuel/modules/.+|fuel/application/.+|\.git.+) - [F,L]


RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule .* index.php/$0 [L]
</IfModule>
Options -Indexes

RewriteRule .* index.php/$0 [L] 表示在主机后面加入index.php这个文件进入单一入口

# Protect application and system files from being viewed
RewriteRule ^(fuel/install/.+|fuel/crons/.+|fuel/data_backup/.+|fuel/codeigniter/.+|fuel/modules/.+|fuel/application/.+|\.git.+) - [F,L] fuel目录下除了传统CI的application、codeigniter目录还多出来moduels目录blog、backup、seo、tester等控制器。

然后要强调的是header、footer等block块，以及theme、layouts布局