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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/workflows/continuous-integration.yml) [](https://github.com/composer/semver/actions/workflows/lint.yml) [](https://github.com/composer/semver/actions/workflows/phpstan.yml) 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.