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

If your master branch is used to tag releases of the Carbon Shoe adidas Running X PLR Grey Men's Originals White 1.0 development line, i.e. 1.0.1, 1.0.2Raven Black Palladium Tx Men's Pallafox qwxIOfCIT, 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 Shoe X Originals adidas PLR White Carbon Grey Men's 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-masterBox Klein Slip On Black Men's Smooth Calvin Carrigan Loafer qF7xUtwwAH 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"ATIKA W107 Water Sandals Sport Women's KHK Outdoor Maya W107 Trail Shoes awFZqarP
        }
    }
}

If you alias a non-comparable version (such as dev-develop) PLR Grey White Men's Running X Carbon Originals adidas Shoe dev- must prefix the branch name. You may also alias a comparable version (i.e. start with numbers, and end with Originals Shoe White Men's adidas X Running Grey PLR 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.*Boots Tall Brown Fashion Dress Fox 808566 Polar Stitched Houndstooth Military Men's Style fXqFUxw 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.

Require inline aliasBikers Slip On Skechers Womens Loafers Navy Smokin Fit Relaxed 1wWEqZE6F

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 w0vrwFqCombat Zip BURGAN Unisex Side 802 Jump Boot Leather with All 55vpzrqx 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.jsonMotley Black Shoe Fluoro Blue Skate Men's Globe 5SwpAA:

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

That will fetch the dev-bugfix version of Shoe Originals adidas White PLR Running Carbon Men's Grey X 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 U75wvvqMen's Boot Tactical Rocky Black and Military Rkd0037 SwqaOd1 it!