php 路由实现类,基于fastroute

<?php
/**
 * 核心路由查找器
 */
use FastRoute\RouteCollector;
use function FastRoute\simpleDispatcher;
use function FastRoute\cachedDispatcher;
class FastRoute {
 public function __construct()
 {
     
/** @var object $dispatcher 导入配置中的路由规则 */
// $dispatcher = simpleDispatcher(function (RouteCollector $r) {
    $dispatcher = cachedDispatcher(function (RouteCollector $r) {
        foreach ($GLOBALS['routeConfig'] as $key => $value) {
            if ($key) {
                $r->addGroup($key, function (RouteCollector $r) use ($key, $value) {
                    foreach ($value as $k => $v) {
                        // 如果控制器配置项为空时，默认根据路由获取控制器
                        $r->addRoute($v[0], $v[1], substr($key, 1) . ucfirst(empty($v[2])
                                                                             ? $v[2] = substr($v[1], 1) . 'Controller'
                                                                             : $v[2]));
                    }
                });
            } else {
                foreach ($value as $k => $v) {
                    $r->addRoute($v[0], $v[1], substr($v[2], 0, 1) === '/'
                    ? substr(empty($v[2])
                                 ? $v[2] = substr($v[1], 1) . 'Controller'
                                 : $v[2], 1)
                    : $v[2]);
                }
            }
        }
    } ,[
        'cacheFile' => BASE_PATH . '/cache/route/route.cache', /* required */
        'cacheDisabled' => DEBUG,     /* optional, enabled by default */
    ]);
    
    // 获取http传参方式和资源URI
    $httpMethod = $_SERVER['REQUEST_METHOD'];
    $uri = $_SERVER['REQUEST_URI'];
    
    // 将url中的get传参方式（?foo=bar）剥离并对URI进行解析
    if (false !== $pos = strpos($uri, '?')) {
        $uri = substr($uri, 0, $pos);
    }
    
    $uri = rawurldecode($uri);
    
    $routeInfo = $dispatcher->dispatch($httpMethod, $uri);
    
    switch ($routeInfo[0]) {
        // 使用未定义格式路由
        case FastRoute\Dispatcher::NOT_FOUND:
            if (!DEBUG) {
                error(404,'404');
            } else {
                throw new \Whoops\Exception\ErrorException('未定义此路由或未在新建文件后使用composer dump-autoload');
            }
            break;
        /**
         * 请求的HTTP⽅法与配置的不符合
         * HTTP规范要求405 Method Not Allowed响应包含“Allow：”头，
         * 用以详细说明所请求资源的可用方法。
         * 使用FastRoute的应用程序在返回405响应时，
         * 应使用数组的第二个元素添加此标头。
         */
        case FastRoute\Dispatcher::METHOD_NOT_ALLOWED:
            
            $allowedMethods = $routeInfo[1];
            header('HTTP/1.1 405 Method Not Allowed');
            $allow = implode(',', $allowedMethods);
            
            header('Allow:' . $allow);
            $errorMsg = "请求方式非法，可使用的请求方式为： $allow";
            if ($_SERVER['REQUEST_METHOD'] === 'GET') {
                error(405, $errorMsg);
            } else {
                exit($errorMsg);
            }
            break;
        
        // 正常
        case FastRoute\Dispatcher::FOUND:
            $handler = $routeInfo[1];
            $class = '\app\controllers\\' . ucfirst($handler);
            $vars = $routeInfo[2];
            $action =  ucfirst(isset($vars['action'])
                                             ? $vars['action']
                                             : 'index');
            unset($vars['action']);
            $_SESSION['route'] = [
                'class'  => substr($handler, 0, strpos(strtolower($handler), 'controller')),
                'action' => strtolower(substr($action, 6))
            ];
            // ... 调用$handler和$vars
            echo   call_user_func_array([
                                     new $class,
                                     $action
                                 ], $vars);
            break;
    }
 }
}

路由配置文件

<?php
/**
 * 路由配置文件
 */
return [
    [
        // 指向首页
        [
            ['GET', 'POST'],
            '/',
            'HomeController'
            
        ],
        [
            ['GET', 'POST'],
            '/demo',
            'DemoController'
        ],
        
        // 指向adminController
        [
            'GET',
            '/admin',
            ''
        ],
        
        // 指向错误页面
        [
            'GET',
            '/error/{code:\d+}',
            'demoController'
        ],
        
        [
            'GET',
            '/user[/{action}]',
            'userController'
        ],
        /*['GET','/user/{id:\d+}/{name}','userController'],*/
    ],
    // 后台路由
    '/admin' => [
        
        // 指向adminUserController
        [
            'GET',
            '/user',
            ''
        ]
    ]
];