为什么 Composer 安装的软件包版本似乎与要求冲突?

Question

这看起来像一个简单的问题，但我无法解释发生了什么。

在我的 Symfony 项目的composer.json中，twig 版本被指定为 <2.0，以避免在 v1 和 v2 之间进行重大更改。 但是，Composer 无论如何都会安装最新的 Twig 版本 (2.4.3(。

php c:phpcomposercomposer.phar depends -t "twig/twig"
twig/twig v2.4.3 Twig, the flexible, fast, and secure template language for PHP
|--symfony/framework-standard-edition dev-develop (requires twig/twig <2.0)
|--symfony/symfony v2.8.24 (requires twig/twig ~1.34|~2.4)
|  `--symfony/framework-standard-edition dev-develop (requires symfony/symfony 2.8.*)
`--twig/extensions v1.5.1 (requires twig/twig ~1.27|~2.0)
`--symfony/framework-standard-edition dev-develop (requires twig/extensions ^1.3)

作曲家.json的相关块：

"require": {
"php": ">=5.3.3",
"symfony/symfony": "2.8.*",
"doctrine/dbal": "2.5.*",
"doctrine/orm": "2.5.*",
"doctrine/doctrine-bundle": "~1.2",
"twig/twig": "<2.0",
"twig/extensions": "^1.3",
etc
}

在我看来，symfony/symfony和twig/extensions包的要求与项目的要求相结合，将导致Twig的最高1.x版本1.34.4，但事实并非如此。 为什么？

编辑：

作曲家 1.4.2

全composer.json

{
"name": "symfony/framework-standard-edition",
"license": "MIT",
"type": "project",
"description": "The "Symfony Standard Edition" distribution",
"autoload": {
"psr-0": { "": "src/", "SymfonyStandard": "app/" }
},
"require": {
"php": ">=5.3.3",
"symfony/symfony": "2.8.*",
"doctrine/dbal": "2.5.*",
"doctrine/orm": "2.5.*",
"doctrine/doctrine-bundle": "~1.2",
"twig/twig": "<2.0",
"twig/extensions": "^1.3",
"symfony/assetic-bundle": "^2.8",
"symfony/swiftmailer-bundle": "~2.3",
"symfony/monolog-bundle": "~2.4",
"sensio/distribution-bundle": "~3.0",
"sensio/framework-extra-bundle": "~3.0",
"incenteev/composer-parameter-handler": "~2.0",
"beberlei/DoctrineExtensions": "^1.0",
"royopa/fpdf-symfony2": "^1.0",
"liuggio/excelbundle": "^2.0",
"patchwork/jsqueeze": "^2.0",
"leafo/scssphp": "^0.6.5",
"doctrine/doctrine-migrations-bundle": "^1.0",
"ocramius/proxy-manager": "~2.0.0",
"aws/aws-sdk-php-symfony": "^1.2"
},
"require-dev": {
"sensio/generator-bundle": "~2.3",
"symfony/phpunit-bridge": "^3.1",
"deployer/deployer": "^3.3"
},
"scripts": {
"post-root-package-install": [
"SymfonyStandard\Composer::hookRootPackageInstall"
],
"post-install-cmd": [
"Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::buildBootstrap",
"Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache",
"Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::installAssets",
"Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::installRequirementsFile",
"Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::removeSymfonyStandardFiles"
],
"post-update-cmd": [
"Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::buildBootstrap",
"Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache",
"Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::installAssets",
"Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::installRequirementsFile",
"Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::removeSymfonyStandardFiles"
]
},
"config": {
"bin-dir": "bin"
},
"extra": {
"symfony-app-dir": "app",
"symfony-web-dir": "web",
"incenteev-parameters": {
"file": "app/config/parameters.yml"
},
"branch-alias": {
"dev-master": "2.5-dev"
}
}
}

编辑2：

删除 composer.lock 并完全更新和重新安装给了我认为我应该得到的东西！

Answer 1

你使用的是哪个版本的作曲家？

我在Linux Mint 17上测试了该json文件，使用php 5.5和composer 1.3.2，安装的twig版本是正确的(twig/twig - v1.34.4(。

您可以尝试粘贴完整的 composer.json 文件吗？

另外，我建议删除composer.lock文件和供应商文件夹的所有内容，然后再次尝试安装。