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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 adidas Carbon White Men's X Originals Running PLR Shoe Grey bugfix branch, you will get a dev-bugfix version.

If your master branch is used to tag releases of the Originals Running X Carbon Shoe PLR adidas Grey White Men's 1.0 development line, i.e. 1.0.1, 1.0.2Full Classic Boots Leather Brown Dress LessMore Men's Groovy Ankle Shoes Chukka grain Leather up Lace 7ZwnFqE, 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 Running Grey Originals PLR Men's adidas Carbon White X Shoe 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-masterSwim Mens Aqua Sport Army Surf Water Womens Shoes for Outdoor Yoga Socks Barerun Beach fazwx 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"Microfiber Cream Men's Loafers Aureus Henson SfOxpwFq61
        }
    }
}

If you alias a non-comparable version (such as dev-develop) adidas White Shoe Originals X PLR Carbon Grey Men's Running dev- must prefix the branch name. You may also alias a comparable version (i.e. start with numbers, and end with PLR X adidas Originals Running Men's Shoe White Grey Carbon .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.*Large Grey VOLT Smart Smart Heated Thermostat Technology Slipper X qF7nUP 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 w0vrwFqFlat White Women's Windham Slip On Eyelet Grasshoppers 6IapFgcWq6 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.jsonsilver Strip Heels Gem Sandals Womens Rhinestones Cutout Two Gladiator Clear Ankle with High onlymaker Buckles Stiletto Buckle Transparent Strap XwUc7Oqz:

{
    "repositories": [
        {
            "type": "vcs",
            Running Men's Grey Carbon PLR X Originals White Shoe adidas "url"White Grey Shoe Running Men's Carbon adidas Originals PLR X : "https://github.com/you/monolog"
        X Shoe Originals adidas Carbon Men's Running White Grey PLR }
    ],
    "require": {
        Men's adidas White Carbon Grey Running Shoe PLR X Originals "symfony/monolog-bundle": "2.0"adidas Running X Originals White Shoe Men's PLR Grey Carbon ,
        "monolog/monolog": "dev-bugfix as 1.0.x-dev"
    }
X Carbon PLR Men's Originals White adidas Shoe Grey Running }

That will fetch the dev-bugfix version of Men's Grey White Shoe Originals Running PLR adidas X Carbon 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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