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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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Writing lock file
Installing dependencies from lock file (including require-dev)
Package 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 symfony/var-dumper (v4.4.42): Extracting archive
- Installing symfony/polyfill-ctype (v1.25.0): Extracting archive
- Installing phpoption/phpoption (1.8.1): Extracting archive
- Installing vlucas/phpdotenv (v3.6.10): Extracting archive
- Installing symfony/css-selector (v4.4.37): Extracting archive
- Installing tijsverkoyen/css-to-inline-styles (2.2.4): Extracting archive
- Installing symfony/routing (v4.4.41): Extracting archive
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- Installing symfony/polyfill-php73 (v1.25.0): Extracting archive
- Installing symfony/polyfill-intl-normalizer (v1.25.0): Extracting archive
- Installing symfony/polyfill-intl-idn (v1.25.0): Extracting archive
- Installing symfony/mime (v4.4.42): Extracting archive
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- Installing symfony/http-client-contracts (v1.1.12): Extracting archive
- Installing symfony/event-dispatcher-contracts (v1.1.12): Extracting archive
- Installing symfony/event-dispatcher (v4.4.42): Extracting archive
- Installing psr/log (1.1.4): Extracting archive
- Installing symfony/debug (v4.4.41): Extracting archive
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- Installing symfony/http-kernel (v4.4.42): Extracting archive
- Installing symfony/finder (v4.4.41): Extracting archive
- Installing psr/container (1.0.0): Extracting archive
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- Installing symfony/console (v4.4.42): Extracting archive
- Installing symfony/polyfill-iconv (v1.25.0): Extracting archive
- Installing doctrine/lexer (1.2.3): Extracting archive
- 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
- Installing ramsey/uuid (3.9.6): Extracting archive
- Installing psr/simple-cache (1.0.1): Extracting archive
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- Installing symfony/translation-contracts (v1.1.12): Extracting archive
- Installing symfony/translation (v4.4.41): Extracting archive
- Installing nesbot/carbon (2.58.0): Extracting archive
- Installing monolog/monolog (1.27.0): Extracting archive
- Installing league/flysystem (1.0.70): Extracting archive
- Installing erusev/parsedown (1.7.4): Extracting archive
- Installing dragonmantank/cron-expression (v2.3.1): Extracting archive
- Installing doctrine/inflector (1.4.4): Extracting archive
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- Installing beyondcode/laravel-dump-server (1.3.0): 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 psy/psysh (v0.9.12): Extracting archive
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- Installing hamcrest/hamcrest-php (v2.0.1): Extracting archive
- Installing mockery/mockery (1.3.5): Extracting archive
- Installing filp/whoops (2.14.5): Extracting archive
- Installing nunomaduro/collision (v3.1.0): Extracting archive
- Installing webmozart/assert (1.9.1): Extracting archive
- Installing phpdocumentor/reflection-common (2.1.0): Extracting archive
- Installing phpdocumentor/type-resolver (1.0.1): Extracting archive
- Installing phpdocumentor/reflection-docblock (4.3.4): Extracting archive
- Installing phpunit/php-token-stream (3.1.3): Extracting archive
- Installing sebastian/version (2.0.1): Extracting archive
- Installing sebastian/resource-operations (2.0.2): Extracting archive
- Installing sebastian/recursion-context (3.0.1): Extracting archive
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- Installing sebastian/global-state (2.0.0): Extracting archive
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- Installing sebastian/diff (3.0.3): 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>
