本篇文章給大家帶來的內容是關于Laravel框架下路由的使用（原始碼決議），有一定的參考價值，有需要的朋友可以參考一下，希望對你有所幫助，
前言
我的決議文章并非深層次多領域的決議攻略，但是參考著開發檔案看此類文章會讓你在日常開發中更上一層樓，
廢話不多說，我們開始本章的講解，
入口
Laravel啟動后，會先加載服務提供者、中間件等組件，在查找路由之前因為我們使用的是門面，所以先要查到Route的物體類，
注冊
第一步當然還是通過服務提供者，因為這是laravel啟動的關鍵，在 RouteServiceProvider 內加載路由檔案，
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protected function mapApiRoutes()
{
Route::prefix('api')
->middleware('api')
->namespace($this->namespace) // 設定所處命名空間
->group(base_path('routes/api.php')); //所得路由檔案絕對路徑
}
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首先require是不可缺少的，因路由檔案中沒有命名空間， Illuminate\Routing\Router 下方法
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protected function loadRoutes($routes)
{
if ($routes instanceof Closure) {
$routes($this);
} else {
$router = $this;
require $routes;
}
}
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隨后通過路由找到指定方法,依舊是 Illuminate\Routing\Router 內有你所使用的所有路由相關方法，例如get、post、put、patch等等，他們都呼叫了統一的方法 addRoute
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public function addRoute($methods, $uri, $action)
{
return $this->routes->add($this->createRoute($methods, $uri, $action));
}
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之后通過 Illuminate\Routing\RouteCollection addToCollections 方法添加到集合中
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protected function addToCollections($route)
{
$domainAndUri = $route->getDomain().$route->uri();
foreach ($route->methods() as $method) {
$this->routes[$method][$domainAndUri] = $route;
}
$this->allRoutes[$method.$domainAndUri] = $route;
}
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添加后的結果如下圖所示
呼叫
通過 Illuminate\Routing\Router 方法開始運行路由實體化的邏輯
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protected function runRoute(Request $request, Route $route)
{
$request->setRouteResolver(function () use ($route) {
return $route;
});
$this->events->dispatch(new Events\RouteMatched($route, $request));
return $this->prepareResponse($request,
$this->runRouteWithinStack($route, $request)
);
}
....
protected function runRouteWithinStack(Route $route, Request $request)
{
$shouldSkipMiddleware = $this->container->bound('middleware.disable') &&
$this->container->make('middleware.disable') === true;
$middleware = $shouldSkipMiddleware ? [] : $this->gatherRouteMiddleware($route);
return (new Pipeline($this->container))
->send($request)
->through($middleware)
->then(function ($request) use ($route) {
return $this->prepareResponse(
$request, $route->run() // 此處呼叫run方法
);
});
}
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在 Illuminate\Routing\Route 下 run 方用于執行控制器的方法
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public function run()
{
$this->container = $this->container ?: new Container;
try {
if ($this->isControllerAction()) {
return $this->runController(); //運行一個路由并作出回應
}
return $this->runCallable();
} catch (HttpResponseException $e) {
return $e->getResponse();
}
}
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從上述方法內可以看出 runController 是運行路由的關鍵,方法內運行了一個調度程式，將控制器 $this->getController() 和控制器方法 $this->getControllerMethod() 傳入到 dispatch 調度方法內
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protected function runController()
{
return $this->controllerDispatcher()->dispatch(
$this, $this->getController(), $this->getControllerMethod()
);
}
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這里注意 getController() 才是真正的將控制器實體化的方法
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public function getController()
{
if (! $this->controller) {
$class = $this->parseControllerCallback()[0]; // 0=>控制器 xxController 1=>方法名 index
$this->controller = $this->container->make(ltrim($class, '\\')); // 交給容器進行反射
}
return $this->controller;
}
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鏈接：https://pan.baidu.com/s/1v5gm7n0L7TGyejCmQrMh2g 提取碼：x2p5
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實體化
依舊通過反射加載路由指定的控制器,這個時候build的引數$concrete = App\Api\Controllers\XxxController
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public function build($concrete)
{
// If the concrete type is actually a Closure, we will just execute it and
// hand back the results of the functions, which allows functions to be
// used as resolvers for more fine-tuned resolution of these objects.
if ($concrete instanceof Closure) {
return $concrete($this, $this->getLastParameterOverride());
}
$reflector = new ReflectionClass($concrete);
// If the type is not instantiable, the developer is attempting to resolve
// an abstract type such as an Interface of Abstract Class and there is
// no binding registered for the abstractions so we need to bail out.
if (! $reflector->isInstantiable()) {
return $this->notInstantiable($concrete);
}
$this->buildStack[] = $concrete;
$constructor = $reflector->getConstructor();
// If there are no constructors, that means there are no dependencies then
// we can just resolve the instances of the objects right away, without
// resolving any other types or dependencies out of these containers.
if (is_null($constructor)) {
array_pop($this->buildStack);
return new $concrete;
}
$dependencies = $constructor->getParameters();
// Once we have all the constructor's parameters we can create each of the
// dependency instances and then use the reflection instances to make a
// new instance of this class, injecting the created dependencies in.
$instances = $this->resolveDependencies(
$dependencies
);
array_pop($this->buildStack);
return $reflector->newInstanceArgs($instances);
}
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這時將回傳控制器的實體，下面將通過url訪問指定方法，一般控制器都會繼承父類 Illuminate\Routing\Controller ,laravel為其設定了別名 BaseController
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public function dispatch(Route $route, $controller, $method)
{
$parameters = $this->resolveClassMethodDependencies(
$route->parametersWithoutNulls(), $controller, $method
);
if (method_exists($controller, 'callAction')) {
return $controller->callAction($method, $parameters);
}
return $controller->{$method}(...array_values($parameters));
}
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Laravel通過controller繼承的callAction去呼叫子類的指定方法，也就是我們希望呼叫的自定義方法，
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public function callAction($method, $parameters)
{
return call_user_func_array([$this, $method], $parameters);
}
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標籤：PHP
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