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Merge pull request #1290 from igorw/platform-package-doc 

Document platform packages, closes #618
pull/1303/head
Jordi Boggiano 2012-11-08 06:02:52 -08:00
parent 77220b380c a1a9760f5b
commit 150b7867e3
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@ -26,6 +26,27 @@ vendor name. Supplying a vendor name is mandatory.
username is usually a good bet. While package names are case insensitive, the
convention is all lowercase and dashes for word separation.
## Platform packages
Composer has platform packages, which are virtual packages for things that are
installed on the system but are not actually installable by composer. This
includes PHP itself, PHP extensions and some system libraries.
* `php` represents the PHP version of the user, allowing you to apply
constraints, e.g. `>=5.4.0`.
* `ext-<name>` allows you to require PHP extensions (includes core
extensions). Versioning can be quite inconsistent here, so it's often
a good idea to just set the constraint to `*`. An example of an extension
package name is `ext-gd`.
* `lib-<name>` allows constraints to be made on versions of libraries used by
PHP. The following are available: `curl`, `iconv`, `libxml`, `openssl`,
`pcre`, `uuid`, `xsl`.
You can use `composer show --platform` to get a list of your locally available
platform packages.
## Specifying the version
You need to specify the package's version some way. When you publish your