问题描述
我的目标是运行Composer的 require 命令来初始化Symfony Console项目。
My goal is to run a Composer's require command to initialise a Symfony Console project.
在运行Composer时 require 命令，我相信可以将所需的软件包限制为特定版本。
When running composer's require command, I believe it is possible to restrict the required package to specific a version.
我正在考虑使用
根据当前的LTS版本是 3.4 。
According to the Symfony Release Process the current LTS version is 3.4.
根据和，该软件包和版本可以指定表示为： symfony / console：〜3.4 。
According to Composer's require command documentation and Composer's version constraints documentation, the package and version can be specified as: symfony/console:~3.4.
但是，当我运行 composer 命令在一个空目录中安装symfony / console 3.4我遇到以下错误。 （我的MacOS High Sierra上安装了PHP和Composer）：
However, when I run the composer command to install symfony/console 3.4 in an empty directory I get the following errors. (I have PHP and Composer is installed on my MacOS High Sierra):
$ mkdir foo
$ cd foo
$ composer self-update
You are already using composer version 1.6.2 (stable channel).
Johns-MBP:foo jw$ php --version
PHP 7.1.7 (cli) (built: Jul 15 2017 18:08:09) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.1.0, Copyright (c) 1998-2017 Zend Technologies
我创建了一个新目录，将其更改为该目录，确保composer已更新为最新版本，并确保PHP为7。*。
I have created a new directory, changed into it, ensured composer is updated to the latest version and ensured PHP is 7.*.
$ composer require symfony/console:~3.4
No composer.json in current directory, do you want to use the one at /Users/me/Documents/Projects/FilterProject/filter-environment? [Y,n]? Y
./composer.json has been updated
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 symfony/console v3.4.3
- Conclusion: don't install symfony/console v3.4.2
- Conclusion: don't install symfony/console v3.4.1
- symfony/process v2.6.4 conflicts with symfony/console[v3.4.0].
- symfony/console v3.4.0 conflicts with symfony/process[v2.6.4].
- Installation request for symfony/console ~3.4 -> satisfiable by symfony/console[v3.4.0, v3.4.1, v3.4.2, v3.4.3].
- Installation request for symfony/process (locked at v2.6.4, required as ~2.0) -> satisfiable by symfony/process[v2.6.4].
Installation failed, reverting ./composer.json to its original content.
我对Symfony还是很陌生，因此可能会误解用于Symfony内核的版本号之间的联系
I am quite new to Symfony and so may be misunderstanding the connection between the version number used for Symfony core versus the version number used by Symfony/console.
哪个composer命令运行一次以要求的LTS版本
Which composer command does one run to require the LTS version of Symfony Console in fresh project?
推荐答案
由于@Cerad的评论，我设法使它起作用。
I have managed to get this to work, thanks to @Cerad's comment.
首先，我确保拥有最新版本的composer和PHP 7。
First, I ensured that I have the latest version of composer and PHP 7.
然后我重新运行该命令并发现了问题所在：
Then I re-ran the command and spotted the problem:
我正在将这个应用程序安装在Homestead Improvement项目的子文件夹中，并且作曲家互动地要求我使用其编写器.json 文件！
I was installing this application in a sub-folder of a Homestead Improved project and composer was interactively asking me to use its composer.json file!
我很草率，没有完全阅读交互式问题。我以为是要我创建一个新的 composer.json 文件。但是相反，它询问的是我是否要修改上面父项目的composer.json文件。
I was being sloppy and did not read the interactive question fully. I assumed it was asking me to create a new composer.json file. But instead it was asking if I wanted to ammend the composer.json file of the parent project above.
$ composer require symfony/console:~3.4
No composer.json in current directory, do you want to use
the one at /Users/me/Documents/Projects/FilterProject/filter-environment? [Y,n]? Y
如果我回答了 Y ，那么我的选择与父项目中的某些依赖项冲突。
If I answered Y then my choice conflicts with some dependencies in the parent project.
通过选择 n 的正确答案，我没有问题，并且工作正常。
By choosing the correct answer of n I did not have a problem and it worked OK.
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