路由解析与分发基础理解

index.php文件中的内容

$config=[
    'route'=>[
        'module'=>'admin',
        'controller'=>'Index',
        'action'=>'index'
    ]
];

class Route
{
//    默认路由
    private $route=[];
//    默认控制器
    private $pathinfo=[];
//    默认参数
    private $params=[];
//    实例化时,配置默认路由
    public function __construct($route)
    {
        $this->route=$route;
    }
    public function parse($path='')
    {
//        获取路由
//        $path=$_SERVER['QUERY_STRING'];
//        1.去掉首位的/
//        2.全部变成小写
//        3.根据/切割成数组
//        4.去掉数组两侧的空值
        $path=trim($path,'/');
        $path=strtolower($path);
        $path=explode('/',$path);
//        $path=array_filter($path);
//        echo '<pre>'.print_r($path,true).'</pre>';
        /*
         *       判断$path的长度
         *          0:没有参数部分时进入首页
         *          1、2、3：分别代表只有模块、控制器、操作
         *          其他：代表有参数,将前三个删除，对参数部分单独处理
         * */
        switch (count($path)){
            case 0:
                $this->pathinfo=$this->route;
                break;
            case 1:
                $this->pathinfo['module']=$path[0];
                break;
            case 2:
                $this->pathinfo['module']=$path[0];
                $this->pathinfo['controller']=$path[1];
                break;
            case 3:
                $this->pathinfo['module']=$path[0];
                $this->pathinfo['controller']=$path[1];
                $this->pathinfo['action']=$path[2];
                break;
            default:
                /*
                 * 处理参数，先获取参数部分存在$path
                 * 循环$path，匹配键值对
                 * 如果有键没值，则匹配失败，不存入参数
                 * */
                $this->pathinfo['module']=$path[0];
                $this->pathinfo['controller']=$path[1];
                $this->pathinfo['action']=$path[2];
                $path=array_slice($path,3);
                for($i=0;$i<count($path);$i+=2){
                    if(isset($path[$i+1])){
                        $this->params[$path[$i]]=$path[$i+1];
                    }
                }
                break;
        }


//        echo '<pre>'.print_r($this->params,true).'</pre>';

//         返回route，方便以后链式访问
        return $this;
    }
    public function dispatch()
    {
        $module=$this->pathinfo['module'];
        $controller=$this->pathinfo['controller'];
        $action=$this->pathinfo['action'];

        $controller='app\\'.$module.'\controller\\'.ucfirst($controller);
//        echo $controller;
//        没有这行代码时，路径出错也会返回到首页，所以删除
//        if(!method_exists($controller,$action)){
//            $action=$this->action;
//            header('Location:/');
//        }
        return call_user_func_array([new $controller,$action],$this->params);
    }
}

$route=new Route($config['route']);
$path=$_SERVER['QUERY_STRING'];
$routes=$route->parse($path);
require __DIR__ . '/app/admin/controller/User.php';
echo $routes=$route->dispatch();

目录 app/admin/controller/User.php
namespace app\admin\controller;

class User
{
    public function add()
    {
       return 'my name is '.$name.', I`m '.$age;
    }
}

访问 127.0.0.1/index.php?admin/user/add/name/php/age/4