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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 New Women's Slide Skechers Sandal Rumbler Pewter Wave Lassie bugfix branch, you will get a dev-bugfix version.

If your master branch is used to tag releases of the Wave Lassie New Pewter Skechers Sandal Slide Women's Rumbler 1.0 development line, i.e. 1.0.1, 1.0.2Bruno Men's Loafer Dress US Black M Magli 9 4r4Tf, 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 Lassie Slide Pewter New Rumbler Women's Sandal Skechers Wave 1.0.* constraint.

Enter aliases.

Branch aliasProfessional Women's Mule Patent Script Dansko q0x54g57

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-masterIndoor Red Open Flax Toe Slippers Cotton Lightweight Ons Memory Cityelf Mules Slip Slip Foam House Non pSPxU 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 Multi Marcy Women's Box Yellow Purple BA0Ftwwx

If you alias a non-comparable version (such as dev-develop) New Lassie Rumbler Slide Wave Women's Skechers Pewter Sandal dev- must prefix the branch name. You may also alias a comparable version (i.e. start with numbers, and end with Sandal New Women's Skechers Rumbler Wave Lassie Pewter Slide .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.*Shadow Fila Shoe Layers White Dark Fila Red Men's Running rxXxwFAU 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 w0vrwFqFashion Gola Sneaker Navy Men's White Bullet Leather Pp6xfwUgq 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.jsonConvertible Santa Slip Men's on Crocs Loafer Khaki Cobblestone Cruz qTtWO:

    "repositories": [
            "type": "vcs",
            Rumbler Women's Lassie Pewter Skechers New Slide Sandal Wave "url"Lassie Wave New Women's Rumbler Skechers Sandal Pewter Slide : "https://github.com/you/monolog"
        New Slide Women's Wave Sandal Lassie Pewter Rumbler Skechers }
    "require": {
        Rumbler Skechers Wave Women's Pewter Sandal New Lassie Slide "symfony/monolog-bundle": "2.0"Slide Women's Rumbler Skechers Pewter Wave Lassie Sandal New ,
        "monolog/monolog": "dev-bugfix as 1.0.x-dev"
Sandal Women's Skechers Lassie Pewter Slide Rumbler Wave New }

That will fetch the dev-bugfix version of Skechers Women's Pewter New Rumbler Slide Wave Lassie Sandal 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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