更新到 Laravel 7 后 php artisan 不起作用

Question

根据文档将 Laravel 升级到 v7 后，我运行了 composer update。然后我得到这个：

脚本@php artisan package:discover --ansi 处理返回错误代码 255 的 post-autoload-dump 事件

这是我的 composer.json 文件：

{
    "name": "laravel/laravel",
    "type": "project",
    "description": "The Laravel Framework.",
    "keywords": [
        "framework",
        "laravel"
    ],
    "license": "MIT",
    "require": {
        "php": "^7.1.3",
        "fideloper/proxy": "^4.0",
        "guzzlehttp/guzzle": "^6.5",
        "kitetail/zttp": "^0.6.0",
        "laravel/framework": "^7.0",
        "laravel/tinker": "^2.0",
        "laravel/telescope": "^2.1",
        "laravelcollective/html": "^6.0",
        "livewire/livewire": "^0.7.4",
        "spatie/laravel-html": "^2.24",
        "spatie/laravel-permission": "^3.0.0"
    },
    "require-dev": {
        "barryvdh/laravel-debugbar": "^3.2",
        "filp/whoops": "^2.0",
        "fzaninotto/faker": "^1.4",
        "laravel/ui": "^2.0",
        "mockery/mockery": "^1.0",
        "nunomaduro/collision": "^4.1",
        "phpunit/phpunit": "^7.5"
    },
    "config": {
        "optimize-autoloader": true,
        "preferred-install": "dist",
        "sort-packages": true
    },
    "extra": {
        "laravel": {
            "dont-discover": []
        }
    },
    "autoload": {
        "psr-4": {
            "App\\": "app/"
        },
        "classmap": [
            "database/seeds",
            "database/factories"
        ]
    },
    "autoload-dev": {
        "psr-4": {
            "Tests\\": "tests/"
        }
    },
    "minimum-stability": "dev",
    "prefer-stable": true,
    "scripts": {
        "post-autoload-dump": [
            "Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
            "@php artisan package:discover --ansi"
        ],
        "post-root-package-install": [
            "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "@php artisan key:generate --ansi"
        ]
    }
}

我现在很困惑。甚至似乎 php artisan 在这个项目中没有做任何事情。在其他项目中，它运行良好。知道如何解决这个问题吗？

编辑：一些答案提供了建议。我使用 Laragon 得到以下信息：

PS C:\laragon\www\attila> composer update
Updating dependencies (including require-dev)
Package operations: 0 installs, 4 updates, 0 removals
  - Updating laravel/framework (v7.0.1 => v7.0.2): Downloading (100%)
  - Updating spatie/laravel-permission (3.10.1 => 3.11.0): Downloading (100%)
  - Updating laravel/ui (v2.0.0 => v2.0.1): Downloading (100%)
  - Updating nunomaduro/collision (v4.1.1 => v4.1.2): Downloading (100%)
Package moontoast/math is abandoned, you should avoid using it. Use brick/math instead.
Writing lock file
Generating optimized autoload files
> @php artisan package:discover --ansi
Script @php artisan package:discover --ansi handling the post-autoload-dump event returned with error code 255
PS C:\laragon\www\attila> php artisan package:discover --ansi
PS C:\laragon\www\attila>

Answer 1

删除bootstrap&storage/framework文件夹中的所有缓存后，仍然没有结果。

运行php artisan --help返回一些错误，这给了我一个问题所在的提示。

检查升级指南后，我解决了这个问题，对我来说是：

• App\Exceptions\Handler方法的变化
• 安装require laravel/ui包