Subversion-Projekte lars-tiefland.laravel_shop

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Revision Autor Zeilennr. Zeile
148 lars 1 
<?php
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namespace Faker\Calculator;
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class Iban
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{
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    /**
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     * Generates IBAN Checksum
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     *
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     * @param string $iban
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     *
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     * @return string Checksum (numeric string)
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     */
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    public static function checksum($iban)
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    {
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        // Move first four digits to end and set checksum to '00'
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        $checkString = substr($iban, 4) . substr($iban, 0, 2) . '00';
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        // Replace all letters with their number equivalents
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        $checkString = preg_replace_callback(
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            '/[A-Z]/',
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            static function (array $matches): string {
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                return (string) self::alphaToNumber($matches[0]);
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            },
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            $checkString,
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        );
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        // Perform mod 97 and subtract from 98
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        $checksum = 98 - self::mod97($checkString);
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        return str_pad($checksum, 2, '0', STR_PAD_LEFT);
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    }
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    /**
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     * Converts letter to number
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     *
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     * @param string $char
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     *
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     * @return int
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     */
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    public static function alphaToNumber($char)
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    {
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        return ord($char) - 55;
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    }
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    /**
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     * Calculates mod97 on a numeric string
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     *
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     * @param string $number Numeric string
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     *
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     * @return int
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     */
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    public static function mod97($number)
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    {
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        $checksum = (int) $number[0];
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        for ($i = 1, $size = strlen($number); $i < $size; ++$i) {
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            $checksum = (10 * $checksum + (int) $number[$i]) % 97;
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        }
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        return $checksum;
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    }
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    /**
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     * Checks whether an IBAN has a valid checksum
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     *
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     * @param string $iban
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     *
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     * @return bool
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     */
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    public static function isValid($iban)
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    {
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        return self::checksum($iban) === substr($iban, 2, 2);
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    }
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}