Slim是一个微框架。
有一套和Lavarel很相似的路由机制。
有一个很详细的教程，详细到把基础request变量都说得很详细，我会觉得这么微的框架还要谈及这么琐碎的功能，那它本身可能真没什么功能。不过理解这些功能对于PHP程序员打好基础很有好处。比如说，文档会提及ETag，有助于程序员更好地理解缓存知识。
有中间件机制，有Hook机制。
没有显示地描述MVC的设计，没有数据库ORM模型。
PHP developers love Slim for developing Restful APIs and services, thanks to Josh Lockhart for creating this tiny beast. The best thing about starting with a micro framework like slim is that you don’t need to spend time learning it. The code base is so small that you can run through the entire code in a late night session.
Slim is an open source, sophisticated micro framework that comes with URL routing and best in class middleware architecture. It also supports encrypted cookies, flash messages, page templates and caching apart from many other features.
Slim framework is best suited in scenarios where you want to build simple applications or API’s grounds up with full flexibility in your hands. Slim resides at the core of your application and you write the code around as required or plug existing components from other frameworks to create fully functional web application.
Silex and Lumen are two other frameworks similar to Slim that fall into category of micro PHP frameworks.
You can read more about Slim at - Slimframework.com.
参考：http://noeticforce.com/best-php-frameworks-for-modern-web-development
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