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提示：错误信息 Laravel刚开始用的PHP7.3.4这个版本,后来切换到PHP7.1.9这个版本。 
解决方案： 我删除了 vendor 文件夹，然后执行了以下指令：
composer install --ignore-platform-reqs
出现如下报错信息 
最终解决办法 我删除了 vendor 文件夹，删除 composer.lock 文件。
PHP CLi 命令行执行：composer install
PS D:\phpstudy_pro\WWW\Workerman\tt.cc\tla> composer install
No composer.lock file present. Updating dependencies to latest instead of installing from lock file. See https://getcomposer.org/install for more information.
Loading composer repositories with package information
Info from https://repo.packagist.org: [37;44m#StandWith[30;43mUkraine[0m
Updating dependencies
Lock file operations: 84 installs, 0 updates, 0 removals
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- Installing symfony/polyfill-php80 (v1.25.0): Extracting archive
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- Installing vlucas/phpdotenv (v3.6.10): Extracting archive
- Installing symfony/css-selector (v4.4.37): Extracting archive
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- Installing symfony/http-client-contracts (v1.1.12): Extracting archive
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- Installing symfony/event-dispatcher (v4.4.42): Extracting archive
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- Installing egulias/email-validator (2.1.25): Extracting archive
- Installing swiftmailer/swiftmailer (v6.3.0): Extracting archive
- Installing paragonie/random_compat (v9.99.100): Extracting archive
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- Installing symfony/translation-contracts (v1.1.12): Extracting archive
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- Installing fzaninotto/faker (v1.9.2): Extracting archive
- Installing jakub-onderka/php-console-color (v0.2): Extracting archive
- Installing nikic/php-parser (v4.13.2): Extracting archive
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- Installing phpdocumentor/type-resolver (1.0.1): Extracting archive
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75 package suggestions were added by new dependencies, use `composer suggest` to see details.
Package jakub-onderka/php-console-color is abandoned, you should avoid using it. Use php-parallel-lint/php-console-color instead.
Package jakub-onderka/php-console-highlighter is abandoned, you should avoid using it. Use php-parallel-lint/php-console-highlighter instead.
Package swiftmailer/swiftmailer is abandoned, you should avoid using it. Use symfony/mailer instead.
Package fzaninotto/faker is abandoned, you should avoid using it. No replacement was suggested.
Package phpunit/php-token-stream is abandoned, you should avoid using it. No replacement was suggested.
Generating optimized autoload files
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
> @php artisan package:discover --ansi
Discovered Package: [32mbeyondcode/laravel-dump-server[39m
Discovered Package: [32mfideloper/proxy[39m
Discovered Package: [32mlaravel/tinker[39m
Discovered Package: [32mnesbot/carbon[39m
Discovered Package: [32mnunomaduro/collision[39m
[32mPackage manifest generated successfully.[39m
52 packages you are using are looking for funding.
Use the `composer fund` command to find out more!
PS D:\phpstudy_pro\WWW\Workerman\tt.cc\tla>
