Teach you to use composer to implement route loading

The following tutorial column of composer will introduce to you how to use composer to implement route loading. I hope it will be helpful to friends in need!

## See the sample code for this tutorial at https:/ /github.com/johnlui/My-First-Framework-based-on-Composer

Recommend https://github.com/NoahBuscher/Macaw, the corresponding Composer package is noahbuscher/macaw.

 "require": {
    "noahbuscher/macaw": "dev-master"
  },

Composer's automatic loading will maintain an array in memory from the full namespace class name to the file name after each URL drives MFFC/public/index.php, so When we use a class in the code, the file where the class is located will be automatically loaded.
2. We loaded the Macaw class in the routing file: "use NoahBuscher\Macaw\Macaw;", and then called the static method::get() twice. This method does not exist. Will be taken over by __callstatic() in MFFC/vendor/codingbean/macaw/Macaw.php.

3. This function accepts two parameters, method和" role="presentation" style="position: relative;">m ethod##and $methodand$$method 和$params, the former is the specific function name, here it is get, the latter is the parameter passed in this call, that is, Macaw::get('fuck',function(){ …}) in the two parameters. The first parameter is the URL value we want to monitor, and the second parameter is a PHP closure, which serves as a callback and represents what we want to do after the URL is successfully matched.

4. __callstatic() 做的事情也很简单，分别将目标URL（即 /fuck）、HTTP方法（即 GET）和回调代码压入 $routes、$methods 和 $callbacks 三个 Macaw 类的静态成员变量（数组）中。

5. 路由文件最后一行的 Macaw::dispatch(); 方法才是真正处理当前 URL 的地方。能直接匹配到的会直接调用回调，不能直接匹配到的将利用正则进行匹配。

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