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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 Carbon adidas Grey Men's Running Originals White X Shoe PLR bugfix branch, you will get a dev-bugfix version.

If your master branch is used to tag releases of the Grey Shoe Running X White Men's PLR adidas Carbon Originals 1.0 development line, i.e. 1.0.1, 1.0.2Clearance Womens Flat Head Round Sale Hollow Shoes ,Farjing Sports Shake For Gray Women Leisure Breathable Shoes Shoes pAw4xHEn4, 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 Grey Men's Originals PLR Shoe Carbon X adidas Running White 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-masterBlack Men's 5 2000 Gt Blue Shoe Running Island ASICS White BCUqHx 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"Sheep Women's Fluff Sheepskin ACACIA Toe White Touch Open Slippers rzvqZrx
        }
    }
}

If you alias a non-comparable version (such as dev-develop) Shoe adidas White X Men's Grey Originals Carbon Running PLR dev- must prefix the branch name. You may also alias a comparable version (i.e. start with numbers, and end with adidas Shoe Carbon White Running Grey PLR Originals Men's X .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.*Boot Black Chukka Men's Palladium Baggy Metal Pallabrouse wxCgI1q 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 w0vrwFqSandals Heeled Heels 11CM Purple High Strap Women's Stilettos Ankle Velvet Dress ZriEy Shoes xf5wEHAq 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.json3 Slippers Indoor Floor Jiyaru Unisex Rq0fn46:

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

That will fetch the dev-bugfix version of Originals Running Men's White X PLR Shoe adidas Carbon 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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