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Revision Autor Zeilennr. Zeile
148 lars 1 
<?php
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namespace Faker\Calculator;
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/**
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 * Utility class for validating EAN-8 and EAN-13 numbers
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 */
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class Ean
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{
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    /**
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     * @var string EAN validation pattern
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     */
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    public const PATTERN = '/^(?:\d{8}|\d{13})$/';
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    /**
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     * Computes the checksum of an EAN number.
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     *
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     * @see https://en.wikipedia.org/wiki/International_Article_Number
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     *
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     * @param string $digits
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     *
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     * @return int
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     */
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    public static function checksum($digits)
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    {
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        $sequence = (strlen($digits) + 1) === 8 ? [3, 1] : [1, 3];
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        $sums = 0;
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        foreach (str_split($digits) as $n => $digit) {
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            $sums += ((int) $digit) * $sequence[$n % 2];
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        }
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        return (10 - $sums % 10) % 10;
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    }
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    /**
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     * Checks whether the provided number is an EAN compliant number and that
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     * the checksum is correct.
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     *
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     * @param string $ean An EAN number
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     *
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     * @return bool
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     */
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    public static function isValid($ean)
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    {
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        if (!preg_match(self::PATTERN, $ean)) {
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            return false;
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        }
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        return self::checksum(substr($ean, 0, -1)) === (int) substr($ean, -1);
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    }
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}