Classes List

Symfony\Component\Intl\Util\Version

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<?php

/* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */


namespace Symfony\Component\Intl\Util;

/** * Facilitates the comparison of version strings. * * @author Bernhard Schussek <bschussek@gmail.com> */
class Version
{
    /** * Compares two versions with an operator. * * This method is identical to {@link version_compare()}, except that you * can pass the number of regarded version components in the last argument * $precision. * * Examples: * * Version::compare('1.2.3', '1.2.4', '==') * // => false * * Version::compare('1.2.3', '1.2.4', '==', 2) * // => true * * @param string $version1 A version string * @param string $version2 A version string to compare * @param string $operator The comparison operator * @param int|null $precision The number of components to compare. Pass * NULL to compare the versions unchanged. * * @return bool Whether the comparison succeeded * * @see normalize() */
    public static function compare($version1$version2$operator$precision = null)
    {
        $version1 = self::normalize($version1$precision);
        $version2 = self::normalize($version2$precision);

        return version_compare($version1$version2$operator);
    }

    /** * Normalizes a version string to the number of components given in the * parameter $precision. * * Examples: * * Version::normalize('1.2.3', 1); * // => '1' * * Version::normalize('1.2.3', 2); * // => '1.2' * * @param string $version A version string * @param int|null $precision The number of components to include. Pass * NULL to return the version unchanged. * * @return string|null the normalized version or NULL if it couldn't be * normalized */
    public static function normalize($version$precision)
    {
        if (null === $precision) {
            return $version;
        }

        $pattern = '[^\.]+';

        for ($i = 2$i <= $precision++$i) {
            $pattern = sprintf('[^\.]+(\.%s)?'$pattern);
        }

        if (!preg_match('/^'.$pattern.'/'$version$matches)) {
            return;
        }

        return $matches[0];
    }

    /** * Must not be instantiated. */
    private function __construct()
    {
    }
}