我尝试在现有的Symfony 3.4应用程序上安装api平台，该应用程序在没有flex的情况下安装。
当我尝试使用composer require api-platform/core安装它时，发生了错误：
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
Problem 1
- Conclusion: don't install api-platform/core v2.4.3
- Conclusion: don't install api-platform/core v2.4.2
- Conclusion: don't install api-platform/core v2.4.1
- Conclusion: remove symfony/symfony v3.4.21
- Installation request for api-platform/core ^2.4 -> satisfiable by api-platform/core[v2.4.0, v2.4.1, v2.4.2, v2.4.3].
- Conclusion: don't install symfony/symfony v3.4.21
- api-platform/core v2.4.0 requires symfony/web-link ^4.1 -> satisfiable by symfony/web-link[v4.1.0, v4.1.1, v4.1.10, v4.1.11, v4.1.12, v4.1.2, v4.1.3, v4.1.4, v4.1.5, v4.1.6, v4.1.7, v4.1.8, v4.1.9, v4.2.0, v4.2.1, v4.2.2, v4.2.3, v4.2.4, v4.2.5, v4.2.6, v4.2.7, v4.2.8].
- don't install symfony/web-link v4.1.0|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.1.1|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.1.10|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.1.11|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.1.12|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.1.2|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.1.3|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.1.4|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.1.5|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.1.6|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.1.7|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.1.8|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.1.9|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.2.0|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.2.1|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.2.2|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.2.3|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.2.4|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.2.5|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.2.6|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.2.7|don't install symfony/symfony v3.4.21
- don't install symfony/web-link v4.2.8|don't install symfony/symfony v3.4.21
- Installation request for symfony/symfony 3.4.21 -> satisfiable by symfony/symfony[v3.4.21].
Installation failed, reverting ./composer.json to its original content.
这是我目前的作曲家需要(和要求开发)部分：
"require": {
"php": ">=7.2",
"ext-curl": "*",
"ext-exif": "*",
"ext-json": "*",
"accord/mandrill-swiftmailer-bundle": "^1.3",
"beberlei/DoctrineExtensions": "^1.0",
"braincrafted/bootstrap-bundle": "^2.2",
"bukashk0zzz/hellosign-bundle": "^1.0",
"callr/sdk-php": "^0.11.1",
"doctrine/doctrine-bundle": "^1.6",
"doctrine/doctrine-migrations-bundle": "^1.3",
"doctrine/orm": "^2.5",
"dopiaza/slack-exception-logger-bundle": "^2.0",
"facebook/graph-sdk": "^5.6",
"friendsofsymfony/oauth-server-bundle": "^1.6",
"friendsofsymfony/rest-bundle": "^2.3",
"friendsofsymfony/user-bundle": "2.0.*",
"google/apiclient": "^2.2",
"google/cloud-storage": "^1.10",
"hpatoio/bitly-bundle": "^1.0",
"incenteev/composer-parameter-handler": "^2.0",
"jms/serializer-bundle": "^2.3",
"knplabs/knp-paginator-bundle": "^2.7",
"liip/imagine-bundle": "^1.9",
"nelmio/api-doc-bundle": "^3.3",
"nelmio/cors-bundle": "^1.5",
"phobetor/rabbitmq-supervisor-bundle": "^3.1",
"php-amqplib/rabbitmq-bundle": "^1.14",
"predis/predis": "^1.1",
"sensio/distribution-bundle": "^5.0.19",
"sensio/framework-extra-bundle": "^5.0.0",
"sentry/sentry-symfony": "^2.0",
"snc/redis-bundle": "^2.0",
"stof/doctrine-extensions-bundle": "^1.3",
"symfony/assetic-bundle": "^2.8",
"symfony/monolog-bundle": "^3.1.0",
"symfony/polyfill-apcu": "^1.0",
"symfony/swiftmailer-bundle": "^2.6.4",
"symfony/symfony": "3.4.21",
"twig/extensions": "^1.5",
"twig/twig": "^1.0||^2.0"
},
"require-dev": {
"brianium/paratest": "^1.1",
"doctrine/doctrine-fixtures-bundle": "^3.0",
"escapestudios/symfony2-coding-standard": "3.x-dev",
"friendsofphp/php-cs-fixer": "^2.14",
"liip/functional-test-bundle": "^1.9",
"phpmd/phpmd": "^2.6",
"phpunit/phpunit": "^6",
"sensio/generator-bundle": "^3.1",
"squizlabs/php_codesniffer": "*",
"symfony/phpunit-bridge": "^4.0"
},
我找不到任何方法来解决我的问题，作曲家的错误也不是很明确，所以我不明白我错过了什么。
看起来api-platform/core ^2.4与symfony/symfony v3.4.21不兼容，因为它需要symfony/web-link v4.1.0而且我很确定所有symfony v4分支捆绑包都是针对symfony 4的，请尝试使用api-platform/core v2.2它似乎对任何严格的v4分支捆绑包没有任何依赖。 https://github.com/api-platform/core/blob/2.2/composer.json