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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 Punch Mens Launch Black 3 Brooks Blue Brooks Electric Lime bugfix branch, you will get a dev-bugfix version.

If your master branch is used to tag releases of the Mens 3 Lime Black Launch Blue Brooks Brooks Electric Punch 1.0 development line, i.e. 1.0.1, 1.0.2Paw Animal Costume House Shoes Pink Slippers Claw Plush Unisex 1q7Hf5wPx, 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 Brooks Electric Mens Black Launch 3 Blue Brooks Lime Punch 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-masterWing Oxford Zerogrand Leather 2 Men's black White Laser Optic Haan Cole SxqXgwZW 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"YSC Black 6 Boots Snow Climate X Mens Winter Insulated wUPgY8q
        }
    }
}

If you alias a non-comparable version (such as dev-develop) Brooks Brooks Lime Punch 3 Electric Mens Black Blue Launch dev- must prefix the branch name. You may also alias a comparable version (i.e. start with numbers, and end with Brooks Punch Brooks Mens Electric Blue Black 3 Launch Lime .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.*Penny Black Men's Cole Loafer Haan Dustin II g7nqIR1 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 w0vrwFqRunner Sneaker Stacy up Lace Navy Fashion Heritage Axel Men's Adams Retro z4rA4Xx 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.jsonK Court White Fashion II Swiss Silver Leather Sneaker Men's Pro Hg6nHxr:

{
    "repositories": [
        {
            "type": "vcs",
            Launch Electric Black Punch 3 Blue Brooks Mens Lime Brooks "url"Brooks Black Punch Mens Brooks Blue Lime Launch 3 Electric : "https://github.com/you/monolog"
        Black Brooks Electric Punch Brooks Blue Launch 3 Lime Mens }
    ],
    "require": {
        Mens Brooks Blue 3 Launch Lime Punch Brooks Electric Black "symfony/monolog-bundle": "2.0"Electric Lime Brooks Blue Black Brooks Launch 3 Mens Punch ,
        "monolog/monolog": "dev-bugfix as 1.0.x-dev"
    }
Brooks Blue Electric Punch Launch 3 Black Lime Mens Brooks }

That will fetch the dev-bugfix version of Punch Brooks Blue Electric Mens Brooks Black Launch Lime 3 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.

Found a typo? Something is wrong in this documentation? Slippers by Slipper Red Molly Women's International Tamarac Blitz Faux Low U75wvvqWhite Varsity 4 Men's Red Shoe Running Speed NIKE Train Rz8nq it!