php - UndefinedFunctionException 试图从命名空间 xxx 调用函数 xxx

Question

我有这个错误(在 silex 2.0 下):

UndefinedFunctionException in app.php line 88: Attempted to call function "postIndexArticle" from namespace "SocialWall\Controller".

in app.php line 88
at {closure}(object(Application)) in Container.php line 113
at Container->offsetGet('home.controller') in CallbackResolver.php line 55
at CallbackResolver->convertCallback('home.controller') in ServiceControllerResolver.php line 50
at ServiceControllerResolver->getController(object(Request)) in HttpKernel.php line 136
at HttpKernel->handleRaw(object(Request), '1') in HttpKernel.php line 68
at HttpKernel->handle(object(Request), '1', true) in Application.php line 496
at Application->handle(object(Request)) in Application.php line 477
at Application->run() in index.php line 17

我的 app.php

<?php

use SocialWall\Controller;

$app['home.controller'] = function($app) {
    return SocialWall\Controller\postIndexArticle($app);
};

我的路由.php

<?php

// Home page
$app->get('/', 'home.controller')->bind('home');

HomeController.php

<?php

namespace SocialWall\Controller;

use Silex\Application;
use SocialWall\DAO\ArticleDAO;

function postIndexArticle(Application $app) {
    return function() use ($app) {
        return new $app['twig']->render('index.html.twig', array('articles' => $app['dao.article']->findAll()));
    };
}

我需要帮助!

Answer 1

我试图重新创建您的演示，它对我有用。我看到您正在关注此处显示的最后一个示例 http://silex.sensiolabs.org/doc/master/providers/service_controller.html提到使用可调用对象作为 Controller :

// app.php
<?php

require_once __DIR__.'/vendor/autoload.php';
require_once 'HomeController.php';

$app = new Silex\Application();
$app['debug'] = true;

$app->register(new Silex\Provider\ServiceControllerServiceProvider());
$app->register(new Silex\Provider\TwigServiceProvider());

$app['home.controller'] = function($app) {
    return \SocialWall\Controller\postIndexArticle($app);
};

// Home page
$app->get('/', 'home.controller')->bind('home');

$app->run();

然后 Controller 在一个单独的文件中:

// HomeController.php
namespace SocialWall\Controller;

use Silex\Application;

function postIndexArticle(Application $app) {
    return function() use ($app) {
        return $app['twig']->createTemplate('test template')->render([]);
    };
}

这只打印测试模板。

所以我认为问题出在这些事情之一(或可能两者):

1. 您的 postIndexArticle 的内部可调用返回 return new $app['twig']->render(... 这是不正确的。你不不想在这里使用关键字 new，因为 render() 方法只返回字符串模板。

2. 我认为您要调用的app.php 或HomeController.php 中的命名空间有问题

   $app['home.controller'] = function($app) {
       return SocialWall\Controller\postIndexArticle($app);
   };
   

   所以尝试使用绝对命名空间路径，就像我对 \SocialWall\Controller\postInd...

所做的那样