## Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

Yaf Configure Options
Name | Default | Changeable | Changelog
--- | --- | --- | ---
yaf.library |  | `INI_ALL` |
yaf.action_prefer | 0 | `INI_ALL` |
yaf.lowcase_path | 0 | `INI_ALL` |
yaf.use_spl_autoload | 0 | `INI_ALL` |
yaf.forward_limit | 5 | `INI_ALL` |
yaf.name_suffix | 1 | `INI_ALL` |
yaf.name_separator |  | `INI_ALL` |
yaf.cache_config | 0 | `INI_SYSTEM` |
yaf.environ | product | `INI_SYSTEM` |
yaf.use_namespace | 0 | `INI_SYSTEM` |

Here's a short explanation of the configuration directives.

`yaf.library` string

  The global library path, Yaf_loader will search global library in this directory.

`yaf.action_prefer` int

  If there is only one part in PATH_INFO, should it consider as a controller or action.

  If this configure On, it will be considered as a Action name.

`yaf.lowcase_path` int

  Whether lowercase all the path during the class autoloading.

`yaf.use_spl_autoload` int

  When this value is On, if Yaf_Loader can not find a class, it will return `false`, then give chance to other auto load function to be called.

  When this value is Off, if Yaf_Loader can not find a class, it will return `true`, and make the class autoloading failed immediately.

  > Note:

  > Yaf will register its loader during a instantiation of Yaf_Application, so any other auto loaders which is register before the instantiation will be called before Yaf_Loader::autoload().

  When this value is Off(default), Yaf_Loader::autoload() will always return `true`.

`yaf.forward_limit` int

  The max forward count, default is 5. that means you can have a max value of 5 in the forward stack.

  This is a protection for prevent recursive Yaf_Controller_Abstract::forward().

`yaf.name_suffix` int

  When this On, Yaf_Loader will identify a class by it's suffix to decide whether it is a MVC Class.

  When this Off, Yaf_Loader will look at the prefix of the class name.

`yaf.name_separator` string

  When this is not empty, Yaf_Loader will identify the class suffix and string value of this.

  For example, when this value is "_", Yaf_Loader will take Index_Controller as a Controller Class, IndexController as a normal class.

`yaf.cache_config` int

  If this is On, and in the meantime you are using ini config file as the parameter of Yaf_Application(), the compiling result of the ini config file will be cached in the PHP process.

  > Note:

  > Yaf examine the mtime of the ini file, if it was changed since last compiling, Yaf will reload it.

  Warning

  Yaf use the ini file path as the cache entry key, so do use the absolute path in ini file path, otherwise there might be some conflicts if two application use the same relative path of ini config.

`yaf.environ` string

  This value is "product" by default, used for Yaf to fetch the config section of a ini config file.

  That is, if this value is "product", Yaf will use the section named "product" in the ini config file(the first parameter of the Yaf_Application) as the final config of the Yaf_Application.

`yaf.use_namespace` int

  If this value is On, All classes of Yaf will named in namespace style.

  For example:

      Yaf_Route_Rewrite => \Yaf\Route\Rewrite
      Yaf_Request_Http  => \Yaf\Request\Http

  There is an exception, that is some classes like Yaf_Controller_Abstract. The last component is a keyword of PHP, could not be used as a class name, so for such classes:

      Yaf_Controller_Abstract => \Yaf\Controller_Abstract
      Yaf_Route_Static => \Yaf\Route_Static

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