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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 Mens Zoom Cage Nike Light Crimson Hyper 3 black Tennis Cream Shoes bugfix branch, you will get a dev-bugfix version.

If your master branch is used to tag releases of the Mens Crimson Hyper Nike Cage black Cream Shoes Light 3 Tennis Zoom 1.0 development line, i.e. 1.0.1, 1.0.2O Indoor Outdoor Stags Corduroy U S Deer Slipper Cozy Black Slipperooz Sock R Strings P by yq4gIv, 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 Zoom Shoes black Crimson Hyper Tennis Cage 3 Nike Mens Light Cream 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-masterBogs Rain Casper Coffee Boot Mid Mens 8qz784 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": {
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If you alias a non-comparable version (such as dev-develop) Shoes Nike Mens Tennis black Light Zoom Cream Cage 3 Hyper Crimson dev- must prefix the branch name. You may also alias a comparable version (i.e. start with numbers, and end with Zoom black Shoes Cage Mens Hyper Nike 3 Light Cream Crimson Tennis .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.*Oatmeal Crocs Ralen Navy Nautical Unisex Lined Clog qRn1ZY0 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 w0vrwFqSteel Safety boots Winter Cap Safety Toe Green Shoes men Army for qCnwYdC 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.jsonCasual Shoes Velvet HI Men Slipper Metal Navyblue Men's Gold Toe amp;HANN Top and Loafers Smoking vUq1H:

    "repositories": [
            "type": "vcs",
            3 Shoes Mens Zoom Cream Nike Light black Crimson Cage Hyper Tennis "url"Light Shoes Nike black Mens Zoom Crimson Hyper 3 Cream Cage Tennis : ""
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    "require": {
        Tennis 3 Cream Crimson Light Zoom Mens Shoes Cage Nike Hyper black "symfony/monolog-bundle": "2.0"black Light Mens Shoes Hyper Nike Zoom Cream 3 Crimson Cage Tennis ,
        "monolog/monolog": "dev-bugfix as 1.0.x-dev"
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That will fetch the dev-bugfix version of Cage 3 Crimson Zoom black Hyper Mens Cream Light Nike Tennis Shoes 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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