php - 新流明5.5项目 'Undefined variable: app'

Question

我是 Lumen 新手，只是尝试创建一个应用程序。我收到一条错误，指出 Application->Laravel\Lumen\Concerns{closure}(8, ' undefined variable : app', '/Users/test/Sites/books/routes/web.php', 14, array( 'router' => object(Router))) 当我尝试使用这段代码时:

$app->group(['prefix' => 'book/'], function() use ($app) {
    $app->get('/','BooksController@index'); //get all the routes    
    $app->post('/','BooksController@store'); //store single route
    $app->get('/{id}/', 'BooksController@show'); //get single route
    $app->put('/{id}/','BooksController@update'); //update single route
    $app->delete('/{id}/','BooksController@destroy'); //delete single route
});

根据文档https://lumen.laravel.com/docs/5.5/routing这应该有效。我正在遵循 https://paulund.co.uk/creating-a-rest-api-with-lumen 中找到的教程我知道 5.5 几天前刚刚发布，所以可能还没有人知道答案，但任何帮助将不胜感激。

Answer 1

似乎有一些未记录的更改。您需要将 $app 更改为 $router 如下:

$router->group(['prefix' => 'book/'], function() use ($router) {
    $router->get('/','BooksController@index'); //get all the routes    
    $router->post('/','BooksController@store'); //store single route
    $router->get('/{id}/', 'BooksController@show'); //get single route
    $router->put('/{id}/','BooksController@update'); //update single route
    $router->delete('/{id}/','BooksController@destroy'); //delete single route
});