composer 如何处理同一个包的多个版本? [英] How does composer handle multiple versions of the same package?

问题描述

这可能(应该)在某处之前被问过，但我似乎找不到答案.如果有人提供链接，我可以删除此帖子！:

This may (should) have been asked before somewhere but I can't seem to find an answer. If someone provides a link I can delete this post!:

只是想了解 Composer 的一些(可能也适用于其他包管理器)的功能.

Just trying to get my head around some of composer's (probably applies to other package managers too) functionality.

基本上我只想知道 composer 在以下场景中做了什么:

Basically I just want to know what composer does in the following scenarios:

1.

我的主项目有一个依赖项:

My main project has a dependency:

"guzzlehttp/guzzle": "5.0.*",

我的外部包依赖于

"guzzlehttp/guzzle": "5.0.*",

composer 是否会安装 guzzlehttp/guzzle 一次，因为它知道它只需要一次?

Does composer install guzzlehttp/guzzle one time because it knows it only needs it once?

2.相同的场景，但将来如果有人更新要使用的主项目:

2. Same scenario but in the future if someone updates the main project to use:

"guzzlehttp/guzzle": "6.0.*",

composer 现在会安装 2 个版本的 guzzle(5 和 6)(我认为这是它应该做的)，还是会采用最高版本(即 6)?此外，如果有 2 个版本，这是否会导致任何冲突，因为命名空间可能相同?

Will composer now install 2 versions of guzzle (5 and 6) (I presume this is what it should do), or will it take the highest version (i.e. 6)? Also if there are 2 versions will this cause any conflicts because namespaces might be the same?

谢谢

推荐答案

到问题 1

是的 Composer 只能安装每个扩展/包的一个版本.

To question 1

Yes Composer can only install one version of each extension/package.

因为答案 1:Composer 会认为您的主项目和外部包不兼容.

Because of answer 1: Composer would consider your main project and the external package as incompatible.

在这种情况下你可以

• 在您的主要项目中也使用第 5 版.
• 如果兼容，也请外部软件包所有者升级到版本 6.
• fork 外部包并使其与版本 6 自己兼容

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