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composer/semver
===============
Semver (Semantic Versioning) 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://github.com/composer/semver/actions)
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`](https://github.com/composer/semver/blob/main/src/Comparator.php) 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, $v2)
Each function takes two version strings as arguments and returns a boolean. For example:
```php
use Composer\Semver\Comparator;
Comparator::greaterThan('1.25.0', '1.24.0'); // 1.25.0 > 1.24.0
```
### Semver
The [`Composer\Semver\Semver`](https://github.com/composer/semver/blob/main/src/Semver.php) class provides the following methods:
* satisfies($version, $constraints)
* satisfiedBy(array $versions, $constraint)
* sort($versions)
* rsort($versions)
### Intervals
The [`Composer\Semver\Intervals`](https://github.com/composer/semver/blob/main/src/Intervals.php) static class provides
a few utilities to work with complex constraints or read version intervals from a constraint:
```php
use Composer\Semver\Intervals;
// Checks whether $candidate is a subset of $constraint
Intervals::isSubsetOf(ConstraintInterface $candidate, ConstraintInterface $constraint);
// Checks whether $a and $b have any intersection, equivalent to $a->matches($b)
Intervals::haveIntersections(ConstraintInterface $a, ConstraintInterface $b);
// Optimizes a complex multi constraint by merging all intervals down to the smallest
// possible multi constraint. The drawbacks are this is not very fast, and the resulting
// multi constraint will have no human readable prettyConstraint configured on it
Intervals::compactConstraint(ConstraintInterface $constraint);
// Creates an array of numeric intervals and branch constraints representing a given constraint
Intervals::get(ConstraintInterface $constraint);
// Clears the memoization cache when you are done processing constraints
Intervals::clear()
```
See the class docblocks for more details.
License
-------
composer/semver is licensed under the MIT License, see the LICENSE file for details.
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