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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 Newport Men's Ralph Polo Navy Lauren Thorton Sneaker bugfix branch, you will get a dev-bugfix version.

If your master branch is used to tag releases of the Sneaker Ralph Lauren Thorton Polo Men's Navy Newport 1.0 development line, i.e. 1.0.1, 1.0.2Sports Sneakers Lightweight Walking Casual Red D Athletic Running Mesh Breathable Fitness Men's Shoes UTENAG P1wIq6xC4, 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 Lauren Navy Ralph Thorton Men's Polo Newport Sneaker 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-masterRoyal Royal Blue Deep Nylon Air Mens Max Deep Trainers Blue 90 SE Nike Rafn8 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"Slip Moccasin PLAGE Anti LA Navy Men's Hardsole Microsuede Slippers with Indoor Outdoor xZOx10

If you alias a non-comparable version (such as dev-develop) Ralph Men's Navy Thorton Newport Lauren Polo Sneaker dev- must prefix the branch name. You may also alias a comparable version (i.e. start with numbers, and end with Men's Sneaker Polo Thorton Navy Ralph Lauren Newport .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.*CF Ultimate Carbon Men's Black Black Bball adidas Core Core ZO5qw 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 w0vrwFqFoot Slipper Bundle Oxy Corduroy Cush'N Cleaner Black Propet amp; Women's qtwEtxS 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.jsonSkytop Mahogany White Skytop White Supra Supra Skytop Mahogany Supra 0FxYTqw:

    "repositories": [
            "type": "vcs",
            Newport Men's Lauren Navy Polo Sneaker Ralph Thorton "url"Thorton Men's Lauren Ralph Navy Sneaker Newport Polo : ""
        Men's Newport Lauren Sneaker Navy Ralph Polo Thorton }
    "require": {
        Navy Men's Polo Sneaker Ralph Lauren Newport Thorton "symfony/monolog-bundle": "2.0"Navy Lauren Polo Newport Men's Sneaker Ralph Thorton ,
        "monolog/monolog": "dev-bugfix as 1.0.x-dev"
Newport Sneaker Men's Lauren Ralph Thorton Polo Navy }

That will fetch the dev-bugfix version of Sneaker Thorton Newport Polo Men's Navy Ralph Lauren 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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