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ValidateVat.php
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ValidateVat.php
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<?php declare(strict_types=1);
namespace App;
use phpDocumentor\Reflection\Types\Integer;
final class ValidateVat
{
/**
* Regular expression patterns per country code
*
* @var array
* @link http://ec.europa.eu/taxation_customs/vies/faq.html?locale=en#item_11
*/
protected static $pattern_expression = [
'IT' => '\d{11}',
];
/**
* Verify IT VAT
*
* @param string $vat
* @return bool
*/
public static function verify(string $vat): bool
{
$vat = self::clean($vat);
$is_valid = self::isValidFormat($vat);
if ($is_valid) {
$result = self::luhnCheck($vat);
return $result % 10 == 0 ? true : false;
}
return false;
}
/**
* A php implementation of Luhn Algo
*
* @link https://en.wikipedia.org/wiki/Luhn_algorithm
* @param string $vat
* @return int
*/
public static function luhnCheck(string $vat): int
{
$sum = 0;
$vat_array = str_split($vat);
for ($index = 0; $index < count($vat_array); $index++) {
$value = intval($vat_array[$index]);
if ($index % 2) {
$value = $value * 2;
if ($value > 9) {
$value = 1 + ($value % 10);
}
}
$sum += $value;
}
return $sum;
}
/**
* Verify if VAT have right format
*
* @param string $vat
* @return bool
*/
public static function isValidFormat(string $vat): bool
{
return preg_match('/^'.self::$pattern_expression['IT'].'$/', $vat) > 0;
}
/**
* Clean VAT spaces
*
* @param string $vat
* @return string
*/
public static function clean(string $vat): string
{
return trim($vat);
}
}