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Semver library that offers utilities, version constraint parsing and validation.

Originally written as part of composer/composer, now extracted and made available as a stand-alone library.

![Build Status](


Install the latest version with:

```bash $ composer require composer/semver ```


  • 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" article in the documentation section of the website.

Basic usage


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;

Comparator::greaterThan('1.25.0', '1.24.0'); // 1.25.0 > 1.24.0 ```


The Composer\Semver\Semver class provides the following methods:

  • satisfies($version, $constraints)
  • satisfiedBy($constraint, array $versions)
  • sort($versions)
  • rsort($versions)


composer/semver is licensed under the MIT License, see the LICENSE file for details.