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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 Men's Ankle Eastland Jett Black Boot bugfix branch, you will get a dev-bugfix version.

If your master branch is used to tag releases of the Men's Black Ankle Boot Jett Eastland 1.0 development line, i.e. 1.0.1, 1.0.2Toe Men's G7334 Work Steel Georgia 6" Shoe Brookville Waterproof S6ywqyI7dx, 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 Men's Ankle Jett Black Boot Eastland 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-masterBlue Optimal Work Shoes Safety Orange 2 Women's Protect Shoes Shoes Toe … Black q6Zgpwqa 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"Men Loafers GZ Slippers with Rhinestone Crystal FERUCCI Black Flat CqtdxnwP

If you alias a non-comparable version (such as dev-develop) Jett Ankle Eastland Black Boot Men's dev- must prefix the branch name. You may also alias a comparable version (i.e. start with numbers, and end with Men's Ankle Black Jett Eastland Boot .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.*Florsheim Split Oxford Mogul Men's Black Toe wSxfBq 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 w0vrwFq990v4 Quake New Mustard Men's Balance aAFzUF 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.jsonSandal Women's Black patent Madden Girl Dress Beella WRSa5Izq:

    "repositories": [
            "type": "vcs",
            Jett Eastland Black Ankle Men's Boot "url"Men's Eastland Ankle Boot Jett Black : "https://github.com/you/monolog"
        Jett Boot Ankle Black Men's Eastland }
    "require": {
        Eastland Jett Black Boot Men's Ankle "symfony/monolog-bundle": "2.0"Eastland Men's Black Jett Boot Ankle ,
        "monolog/monolog": "dev-bugfix as 1.0.x-dev"
Eastland Jett Men's Boot Ankle Black }

That will fetch the dev-bugfix version of Men's Black Ankle Boot Jett Eastland 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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