CakePHP 内核配置变量
配置类通常用于设置CakePHP的核心配置变量，这些变量在app/config/core.php文件中。下面是这些变量的描述以及他们对CakePHP产生的影响。 请注意：core.php文件中也有缓存配置，我们会在后面讲解 配置类可以即时地修改内核配置，这个相当方便，特别是在调试一小段逻辑的时候
变量名描述
debug
设置CakePHP的调试的输出模式
0 = 没有输出结果
1 = 显示错误信息和警告
2 = 显示错误信息，警告和数据库查询语句
3 = 显示错误信息，警告和数据库查询语句，完成控制器转储?
App.baseUrl
不要注释掉这个定义如果你不打算使用Apache的mod_rewrite. 同时不要忘记删除.htaccess文件
Routing.admin
不要注释掉这个变量如果你要用CakePHP的路由(admin route)，变量值跟路由的名字相同，接下来会介绍更多。
Cache.disable
设成true的时候，整个网站的缓存会被关闭。
Cache.check
如果设成true, 开启视图缓存。虽然控制器缓存需要另外开启，但是这个变量可以监控这些设置。
Session.save
CakePHP的session存储机制?
php = 使用默认的PHP session存储
cake = 将session数据保存到/app/tmp目录下
database = 将session保存到数据库表中。但要保证使用/app/config/sql/sessions.sql 这个数据库查询文件来设置表。
Session.table
存储session的表名，不包括前缀
Session.database
存储session的数据库名字
Session.cookie
追踪session的cookie的名字
Session.timeout
session超时的时间，以秒为单位，实际值以Security.level为基准
Session.start
如果为true，sessions自动开启
Session.checkAgent
如果为false，session不会检查各个请求之间的用户没有改变
Security.level
CakePHP安全等级。安全等级的值决定了Session.timeout的值?
Valid values:
'high' = x 10
'medium' = x 100
'low' = x 300
如果设置为：'high' 或者 'medium'，会启动session.referer_check?
如果'Security.level' 设置为 'high'则CakePHP 的 session ID在每一次请求中都会重新生成。
Security.salt
一个随机的字符串用在安全散列法中
Acl.classname, Acl.database
常量，用在CakePHP访问控制列表功能化中。更多内容请参考访问控制列表章节
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