先标记觉得以后会用到的内容：
// add route to the request‘s attributes in case a middleware or handler needs access to the route $request = $request->withAttribute(‘route‘, $route);
或许以后可以在Middleware中拿到route做些其他的事情。
上篇已经分析到route是在APP的__invoke()中被调用的，这里来看看怎么匹配route的。大概的调用过程如下：
if ($routeInfo[0] === Dispatcher::FOUND) {
$route = $router->lookupRoute($routeInfo[1]);
return $route->run($request, $response);
} elseif ($routeInfo[0] === Dispatcher::METHOD_NOT_ALLOWED) {
if (!$this->container->has(‘notAllowedHandler‘)) {
throw new MethodNotAllowedException($request, $response, $routeInfo[1]);
}
/** @var callable $notAllowedHandler */
$notAllowedHandler = $this->container->get(‘notAllowedHandler‘);
return $notAllowedHandler($request, $response, $routeInfo[1]);
}
$route = $router->lookupRoute($routeInfo[1]); 通过route的identify找到route。
route->run执行route。
run的结果最后就是执行自己的__invoke，从所有的middleware开始执行，栈的最后一个元素是自己。
/**
* Dispatch route callable against current Request and Response objects
*
* This method invokes the route object‘s callable. If middleware is
* registered for the route, each callable middleware is invoked in
* the order specified.
*
* @param ServerRequestInterface $request The current Request object
* @param ResponseInterface $response The current Response object
* @return \Psr\Http\Message\ResponseInterface
* @throws \Exception if the route callable throws an exception
*/
public function __invoke(ServerRequestInterface $request, ResponseInterface $response)
{
//debug_print_backtrace();
$this->callable = $this->resolveCallable($this->callable);
/** @var InvocationStrategyInterface $handler */
$handler = isset($this->container) ? $this->container->get(‘foundHandler‘) : new RequestResponse();
// invoke route callable
if ($this->outputBuffering === false) {
$newResponse = $handler($this->callable, $request, $response, $this->arguments);
} else {
try {
ob_start();
$newResponse = $handler($this->callable, $request, $response, $this->arguments);
$output = ob_get_clean();
} catch (Exception $e) {
ob_end_clean();
throw $e;
}
}
if ($newResponse instanceof ResponseInterface) {
// if route callback returns a ResponseInterface, then use it
$response = $newResponse;
} elseif (is_string($newResponse)) {
// if route callback returns a string, then append it to the response
if ($response->getBody()->isWritable()) {
$response->getBody()->write($newResponse);
}
}
if (!empty($output) && $response->getBody()->isWritable()) {
if ($this->outputBuffering === ‘prepend‘) {
// prepend output buffer content
$body = new Http\Body(fopen(‘php://temp‘, ‘r+‘));
$body->write($output . $response->getBody());
$response = $response->withBody($body);
} elseif ($this->outputBuffering === ‘append‘) {
// append output buffer content
$response->getBody()->write($output);
}
}
return $response;
}
学习Slim Framework for PHP v3 (六)--route怎么被匹配的？
原文：http://www.cnblogs.com/lmenglliren89php/p/5164378.html