如何找到冲突的作曲家包？

Question

我正在尝试更新基于PHPUnit的项目的Cilex版本。它有PHPUnit版本的~3.7。当我运行composer require phpunit/phpunit:~6 --dev时，它会打印出：

Problem 1
    - Can only install one of: phpunit/php-code-coverage[5.2.2, 1.2.18].
    - Can only install one of: phpunit/php-code-coverage[5.2.2, 1.2.18].
    - Can only install one of: phpunit/php-code-coverage[5.2.2, 1.2.18].
    - phpunit/phpunit 6.3.0 requires phpunit/php-code-coverage ^5.2.2 -> satisfiable by phpunit/php-code-coverage[5.2.2].
    - Installation request for phpunit/phpunit ^6.3 -> satisfiable by phpunit/phpunit[6.3.0].
    - Installation request for phpunit/php-code-coverage (locked at 1.2.18) -> satisfiable by phpunit/php-code-coverage[1.2.18].

然而，它不会说哪个包是冒犯的一个。编写器文件是这一个。

PS:，我也运行了composer require php:~7.1，以防万一，它起了作用，但是在那之后更新PHPUnit仍然不起作用。

Answer 1

需要带有--update-with-dependencies的包

跑

$ composer require phpunit/phpunit:^6.0.0 --update-with-dependencies

在更新其依赖项的同时更新phpunit/phpunit。

请参阅https://getcomposer.org/doc/03-cli.md#require

• --update-with-dependencies：还更新了新需要的包的依赖项。

列出理由

如果这没什么用，那就跑

$ composer why-not phpunit/phpunit:^6.0.0

若要列出无法安装软件包的原因，请执行以下操作。