README

This component provides Norway vat number format validator.

Implementation of interface rocketfellows\CountryVatFormatValidatorInterface\CountryVatFormatValidatorInterface

Depends on https://github.com/rocketfellows/country-vat-format-validator-interface

Vat number validation description

The technical construction of the number specifies a modulus 11 check digit at the end. The weighting factors are 3, 2, 7, 6, 5, 4, 3, 2 calculated from the first digit. The digits are thus multiplied by the weighting factors and the product sum divided by 11. The leftover from the division is subtracted by 11 and the result becomes the MOD11 checksum digit.

Installation

composer require rocketfellows/no-vat-format-validator

Usage example

Valid Norway vat number (valid expected format and checksum digit):

$validator = new NOVatFormatValidator();
$validator->isValid('NO234154877MVA');
$validator->isValid('NO234154877');
$validator->isValid('234154877MVA');
$validator->isValid('234154877');

Returns:

true
true
true
true

Invalid Norway vat number (invalid format or checksum digit):

$validator = new NOVatFormatValidator();
$validator->isValid('DE234154877MVA'); // invalid format
$validator->isValid('DE234154877'); // invalid format
$validator->isValid('NO234154879MVA'); // invalid checksum digit
$validator->isValid('NO234154879'); // invalid checksum digit
$validator->isValid('234154879'); // invalid checksum digit
$validator->isValid('');

false
false
false
false
false
false

Contributing

Welcome to pull requests. If there is a major changes, first please open an issue for discussion.

Please make sure to update tests as appropriate.