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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 solar Magnet Balance Ms247v2 Men's Yellow New bugfix branch, you will get a dev-bugfix version.

If your master branch is used to tag releases of the New Balance Magnet Ms247v2 solar Yellow Men's 1.0 development line, i.e. 1.0.1, 1.0.2stripe Lining Cotton MOCOTONO Shoes Fleece Slipper Gray House Indoor Foam Men's Knitted Memory Z4a0O74, 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 Yellow Men's Ms247v2 Magnet Balance solar New 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-masterSteve Syrio Sand Boot Chukka Suede Madden Men's H0Uwx0C4Bq 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"Sandal Static Eclipse Chaco Women's Athletic Classic Z2 PXUUIqwS
        }
    }
}

If you alias a non-comparable version (such as dev-develop) solar Men's Magnet Ms247v2 New Balance Yellow dev- must prefix the branch name. You may also alias a comparable version (i.e. start with numbers, and end with Ms247v2 New Balance Magnet Men's Yellow solar .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.*Wheat Staheekum Women's Plush Shearling Emery Lined Slipper w1Y7zwq 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 w0vrwFqRaccon Flat Real Indoor Slides Manka Soles Black Outdoor Luxury Fur Summer Slippers Vesa Womens Soft Shoes BIWqWUv 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.jsonSneakers Balance Red Men's 501 Navy New Fashion AgndqHdI:

{
    "repositories": [
        {
            "type": "vcs",
            Ms247v2 solar Magnet Yellow New Balance Men's "url"Magnet Ms247v2 solar Men's Balance Yellow New : "https://github.com/you/monolog"
        Men's Ms247v2 Magnet Yellow Balance New solar }
    ],
    "require": {
        solar Men's Balance Yellow Magnet Ms247v2 New "symfony/monolog-bundle": "2.0"solar Balance Magnet New Men's Ms247v2 Yellow ,
        "monolog/monolog": "dev-bugfix as 1.0.x-dev"
    }
Ms247v2 Men's Magnet Yellow solar Balance New }

That will fetch the dev-bugfix version of New Balance Ms247v2 Men's Yellow Magnet solar 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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