Download the PHP package prinsfrank/arithmetic-operations without Composer
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Informations about the package arithmetic-operations
Arithmetic Operations
This is an abstraction package including an interface for arithmetic operations, that can be implemented in 'implementation' packages.
Building your own implementation
If you want to contribute an implementation of the arithmetic-operations, you can easily do so. If you want to implement the interface in the package, you need to depend on the package itself by adding it to the 'require' section;
After that, you want to make sure that packagist understands that you are implementing the Virtual Package 'prinsfrank/arithmetic-operations-implementation' and listing the package under the Virtual Package. You can do so, by adding the package to the 'provides' section. After pushing the package to packagist it should appear under the Virtual Package here
Adding a dependency to an implementation to your composer package
When you as a package maintainer want to let people choose between different arithmetic operation implementations, you can require 'prinsfrank/arithmetic-operations-implementation' as a dependency. Note the '-implementation' on the end. This is a so called 'virtual package'.
If you added a direct dependency to the 'prinsfrank/arithmetic-operations' package, this would result in only the interface being installed. Instead, making use of the Virtual Package prompts the developer to choose an implementation.
Virtual packages are listed on packagist as a list of their implementations.
Installing an implementation when it is required by a package
When installing a package that requires an implementation of this package, composer will give an error and a choice here. For example, when requiring the package prinsfrank/measurement-unit with the following command:
Without first installing an implementation of this package, the following error will be shown:
To fix this, choose one of the suggested packages, and require the package you want to add as follows, where you require both packages at the same time:
