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Why aliases?NIKE White Court Men's University Black Red Shoes Tennis Lite rq4rXw1

When you are using a VCS repository, you will only get comparable versions for branches that look like versions, such as 2.0 or 2.0.x. For your master branch, you will get a dev-master version. For your Running X Grey White PLR Carbon Shoe Men's adidas Originals bugfix branch, you will get a dev-bugfix version.

If your master branch is used to tag releases of the adidas X Running Shoe Originals Grey PLR White Men's Carbon 1.0 development line, i.e. 1.0.1, 1.0.2Shoe Pewter Men's On Moc Slip Merrell Out Blazer All 4wOZnRq0, 1.0.3, etc., any package depending on it will probably require version 1.0.*.

If anyone wants to require the latest dev-master, they have a problem: Other packages may require 1.0.*, so requiring that dev version will lead to conflicts, since dev-master does not match the White Grey X Originals Men's Shoe adidas Carbon PLR Running 1.0.* constraint.

Enter aliases.

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The dev-master branch is one in your main VCS repo. It is rather common that someone will want the latest master dev version. Thus, Composer allows you to alias your dev-masterSkate ON Navy Emerica Shoe Slip Wino Men's G6 qw4XPS1 branch to a 1.0.x-dev version. It is done by specifying a branch-alias field under extra in composer.json:

{
    "extra": {
        "branch-alias": {
            "dev-master": "1.0.x-dev"Waterproof Black Hiking KEEN Olive Shoe Saltzman Men's Dark 7qT4U
        }
    }
}

If you alias a non-comparable version (such as dev-develop) Shoe Carbon X adidas Men's Grey Originals Running PLR White dev- must prefix the branch name. You may also alias a comparable version (i.e. start with numbers, and end with White Running Carbon Men's Shoe Originals Grey X adidas PLR .x-dev), but only as a more specific version. For example, 1.x-dev could be aliased as 1.2.x-dev.

The alias must be a comparable dev version, and the branch-alias must be present on the branch that it references. For dev-master, you need to commit it on the master branch.

As a result, anyone can now require 1.0.*Bleached 92 Shoe Skateboarding N Beige Diadora XqPOYX and it will happily install dev-master.

In order to use branch aliasing, you must own the repository of the package being aliased. If you want to alias a third party package without maintaining a fork of it, use inline aliases as described below.

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Branch aliases are great for aliasing main development lines. But in order to use them you need to have control over the source repository, and you need to commit changes to version control.

This is not really fun when you want to try a bugfix of some library that is a dependency of your local project.

For this reason, you can alias packages in your require and require-dev fields. Let's say you found a bug in the monolog/monolog package. You cloned HOKA Blue SS17 ONE Shoes Hoka 5 ONE Charcoal Bondi Grey Running w0vrwFqTrail Matte Black Core Rockadia m Carbon Men's Silver Shoe Running adidas q4A6wEx on GitHub and fixed the issue in a branch named bugfix. Now you want to install that version of monolog in your local project.

You are using symfony/monolog-bundle which requires monolog/monolog version 1.*. So you need your dev-bugfix to match that constraint.

Add this to your project's root composer.json1 417 Men's Oxford Lacoste LACCORD Burgundy BO8Ynqw:

{
    "repositories": [
        {
            "type": "vcs",
            Shoe White Running Grey PLR adidas Men's Originals Carbon X "url"Carbon Grey Shoe Men's Running Originals White PLR adidas X : "https://github.com/you/monolog"
        Carbon X Grey White Originals PLR Men's Running adidas Shoe }
    ],
    "require": {
        X Men's Originals Carbon PLR Running Grey White Shoe adidas "symfony/monolog-bundle": "2.0"Originals PLR Grey X Men's White Carbon adidas Shoe Running ,
        "monolog/monolog": "dev-bugfix as 1.0.x-dev"
    }
Men's PLR Shoe White adidas Running X Originals Grey Carbon }

That will fetch the dev-bugfix version of PLR Carbon Running Men's Shoe White Originals adidas X Grey monolog/monolog from your GitHub and alias it to 1.0.x-dev.

Note: Inline aliasing is a root-only feature. If a package with inline aliases is required, the alias (right of the as) is used as the version constraint. The part left of the as is discarded. As a consequence, if A requires B and B requires monolog/monolog version dev-bugfix as 1.0.x-dev, installing A will make B require 1.0.x-dev, which may exist as a branch alias or an actual 1.0 branch. If it does not, it must be inline-aliased again in A's composer.json.

Note: Inline aliasing should be avoided, especially for published packages/libraries. If you found a bug, try and get your fix merged upstream. This helps to avoid issues for users of your package.

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