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composer/semver
===============
Semver library that offers utilities, version constraint parsing and validation.
Originally written as part of [composer/composer](https://github.com/composer/composer),
now extracted and made available as a stand-alone library.
[](https://travis-ci.org/composer/semver)
Installation
------------
Install the latest version with:
```bash
$ composer require composer/semver
```
Requirements
------------
* PHP 5.3.2 is required but using the latest version of PHP is highly recommended.
Version Comparison
------------------
For details on how versions are compared, refer to the [Versions](https://getcomposer.org/doc/articles/versions.md)
article in the documentation section of the [getcomposer.org](https://getcomposer.org) website.
Basic usage
-----------
### Comparator
The `Composer\Semver\Comparator` class provides the following methods for comparing versions:
* greaterThan($v1, $v2)
* greaterThanOrEqualTo($v1, $v2)
* lessThan($v1, $v2)
* lessThanOrEqualTo($v1, $v2)
* equalTo($v1, $v2)
* notEqualTo($v1, $v2)
Each function takes two version strings as arguments. For example:
```php
use Composer\Semver\Comparator;
Comparator::greaterThan('1.25.0', '1.24.0'); // 1.25.0 > 1.24.0
```
### Semver
The `Composer\Semver\Semver` class provides the following methods:
* satisfies($version, $constraints)
* satisfiedBy($constraint, array $versions)
* sort($versions)
* rsort($versions)
License
-------
composer/semver is licensed under the MIT License, see the LICENSE file for details.