图1
1、执行命令 composer update –ignore-platform-reqs 时，报错：Script @php artisan package:discover –ansi handling the post-autoload-dump event returned with error code 255。如图1
PS E:\wwwroot\larabbs> composer update --ignore-platform-reqs Loading composer repositories with package information Updating dependencies Nothing to modify in lock file Installing dependencies from lock file (including require-dev) Nothing to install, update or remove Package swiftmailer/swiftmailer is abandoned, you should avoid using it. Use symfony/mailer instead. Generating optimized autoload files > Illuminate\Foundation\ComposerScripts::postAutoloadDump > @php artisan package:discover --ansi PHP Parse error: syntax error, unexpected '|', expecting variable (T_VARIABLE) in E:\wwwroot\larabbs\vendor\psr\log\src\LoggerInterface.php on line 30 PHP Fatal error: Exception thrown without a stack frame in Unknown on line 0 PHP Parse error: syntax error, unexpected '|', expecting variable (T_VARIABLE) in E:\wwwroot\larabbs\vendor\psr\log\src\LoggerInterface.php on line 30 PHP Fatal error: Exception thrown without a stack frame in Unknown on line 0 Script @php artisan package:discover --ansi handling the post-autoload-dump event returned with error code 255 PS E:\wwwroot\larabbs>
2、为何 执行命令 composer update 时，添加了选项 –ignore-platform-reqs。原因在于 执行 composer update 时，报错：it is missing from your system. Install or enable PHP’s pcntl extension.。如图2
PS E:\wwwroot\larabbs> composer update
Loading composer repositories with package information
Updating dependencies
Your requirements could not be resolved to an installable set of packages.
Problem 1
- laravel/horizon[v5.6.0, ..., 5.x-dev] require ext-pcntl * -> it is missing from your system. Install or enable PHP's pcntl extension.
- Root composer.json requires laravel/horizon ~5.6 -> satisfiable by laravel/horizon[v5.6.0, ..., 5.x-dev].
To enable extensions, verify that they are enabled in your .ini files:
- C:\php-7.4.27\php.ini
You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.
PS E:\wwwroot\larabbs>
3、基于 Composer 安装 laravel/horizon 时，报错：Package laravel/horizon at version ~5.6 has requirements incompatible with your PHP version, PHP extensions and Composer version。之前执行了命令：composer require “laravel/horizon:~5.6″ –ignore-platform-reqs 。最终决定卸载掉 laravel/horizon。
4、编辑 composer.json，删除行：”laravel/horizon”: “~5.6”,，再次执行命令：composer update。报错：Class ‘Horizon’ not found。如图3
PS E:\wwwroot\larabbs> composer update
Loading composer repositories with package information
Updating dependencies
Lock file operations: 0 installs, 9 updates, 1 removal
- Removing laravel/horizon (v5.7.18)
- Downgrading psr/log (2.0.0 => 1.1.4)
- Downgrading symfony/css-selector (v6.0.2 => v5.4.2)
- Downgrading symfony/deprecation-contracts (v3.0.0 => v2.5.0)
- Downgrading symfony/event-dispatcher (v6.0.2 => v5.4.0)
- Downgrading symfony/event-dispatcher-contracts (v3.0.0 => v2.5.0)
- Upgrading symfony/service-contracts (v2.4.1 => v2.5.0)
- Downgrading symfony/string (v6.0.2 => v5.4.2)
- Downgrading symfony/translation (v6.0.2 => v5.4.2)
- Downgrading symfony/translation-contracts (v3.0.0 => v2.5.0)
Writing lock file
Installing dependencies from lock file (including require-dev)
Package operations: 0 installs, 9 updates, 1 removal
- Removing laravel/horizon (v5.7.18)
- Downgrading symfony/deprecation-contracts (v3.0.0 => v2.5.0): Extracting archive
- Downgrading psr/log (2.0.0 => 1.1.4): Extracting archive
- Downgrading symfony/css-selector (v6.0.2 => v5.4.2): Extracting archive
- Downgrading symfony/event-dispatcher-contracts (v3.0.0 => v2.5.0): Extracting archive
- Downgrading symfony/event-dispatcher (v6.0.2 => v5.4.0): Extracting archive
- Downgrading symfony/string (v6.0.2 => v5.4.2): Extracting archive
- Upgrading symfony/service-contracts (v2.4.1 => v2.5.0): Extracting archive
- Downgrading symfony/translation-contracts (v3.0.0 => v2.5.0): Extracting archive
- Downgrading symfony/translation (v6.0.2 => v5.4.2): Extracting archive
Package swiftmailer/swiftmailer is abandoned, you should avoid using it. Use symfony/mailer instead.
Generating optimized autoload files
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
> @php artisan package:discover --ansi
Error
Class 'Horizon' not found
at E:\wwwroot\larabbs\app\Providers\AuthServiceProvider.php:36
32▕ // 动态返回模型对应的策略名称，如：// 'App\Model\User' => 'App\Policies\UserPolicy',
33▕ return 'App\Policies\\'.class_basename($modelClass).'Policy';
34▕ });
35▕
➜ 36▕ \Horizon::auth(function ($request) {
37▕ // 是否是站长
38▕ return \Auth::user()->hasRole('Founder');
39▕ });
40▕ }
1 E:\wwwroot\larabbs\vendor\laravel\framework\src\Illuminate\Container\BoundMethod.php:36
App\Providers\AuthServiceProvider::boot()
2 E:\wwwroot\larabbs\vendor\laravel\framework\src\Illuminate\Container\Util.php:40
Illuminate\Container\BoundMethod::Illuminate\Container\{closure}()
Script @php artisan package:discover --ansi handling the post-autoload-dump event returned with error code 1
PS E:\wwwroot\larabbs>
5、手动删除配置文件 config/horizon.php 和存放在 public/vendor/horizon 文件夹中的 CSS 、JS 等页面资源文件。删除文件 app/Providers/HorizonServiceProvider.php。编辑文件，删除 Horizon 相关代码。
6、再次执行命令 composer update 时，不再报错。汲取教训，–ignore-platform-reqs 绝对不能够使用才是。如图4
PS E:\wwwroot\larabbs> composer update Loading composer repositories with package information Updating dependencies Nothing to modify in lock file Installing dependencies from lock file (including require-dev) Nothing to install, update or remove Package swiftmailer/swiftmailer is abandoned, you should avoid using it. Use symfony/mailer instead. Generating optimized autoload files > Illuminate\Foundation\ComposerScripts::postAutoloadDump > @php artisan package:discover --ansi Discovered Package: barryvdh/laravel-debugbar Discovered Package: facade/ignition Discovered Package: fruitcake/laravel-cors Discovered Package: intervention/image Discovered Package: laravel/sail Discovered Package: laravel/sanctum Discovered Package: laravel/tinker Discovered Package: laravel/ui Discovered Package: mews/captcha Discovered Package: mews/purifier Discovered Package: nesbot/carbon Discovered Package: nunomaduro/collision Discovered Package: overtrue/laravel-lang Discovered Package: spatie/laravel-permission Discovered Package: summerblue/administrator Discovered Package: summerblue/generator Discovered Package: summerblue/laravel-active Package manifest generated successfully. 84 packages you are using are looking for funding. Use the `composer fund` command to find out more! > @php artisan vendor:publish --tag=laravel-assets --ansi --force No publishable resources for tag [laravel-assets]. Publishing complete. PS E:\wwwroot\larabbs>
