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December 27, 2013 01:45
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Here is a PHP validation class to validate Australian Business Numbers (ABN) and Australian Company Numbers (ACN)
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| <?php | |
| /** | |
| * ABN and ACN Validator Class | |
| * @author Paul Ferrett, 2009 (http://www.paulferrett.com) | |
| */ | |
| class AbnValidator { | |
| /** | |
| * Return true if $number is a valid ABN | |
| * @param string $number | |
| * @return bool True if $number is a valid ABN | |
| */ | |
| public static function isValidAbnOrAcn($number) { | |
| $number = preg_replace('/[^0-9]/', '', $number); | |
| if(strlen($number) == 9) { | |
| return self::isValidAcn($number); | |
| } | |
| if(strlen($number) == 11) { | |
| return self::isValidAbn($number); | |
| } | |
| return false; | |
| } | |
| /** | |
| * Validate an Australian Business Number (ABN) | |
| * @param string $abn | |
| * @link http://www.ato.gov.au/businesses/content.asp?doc=/content/13187.htm | |
| * @return bool True if $abn is a valid ABN, false otherwise | |
| */ | |
| public static function isValidAbn($abn) { | |
| $weights = array(10, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19); | |
| // Strip non-numbers from the acn | |
| $abn = preg_replace('/[^0-9]/', '', $abn); | |
| // Check abn is 11 chars long | |
| if(strlen($abn) != 11) { | |
| return false; | |
| } | |
| // Subtract one from first digit | |
| $abn[0] = ((int)$abn[0] - 1); | |
| // Sum the products | |
| $sum = 0; | |
| foreach(str_split($abn) as $key => $digit) { | |
| $sum += ($digit * $weights[$key]); | |
| } | |
| if(($sum % 89) != 0) { | |
| return false; | |
| } | |
| return true; | |
| } | |
| /** | |
| * Validate an Australian Company Number (ACN) | |
| * @param string $acn | |
| * @link http://www.asic.gov.au/asic/asic.nsf/byheadline/Australian+Company+Number+(ACN)+Check+Digit | |
| * @return bool True if $acn is a valid ACN, false otherwise | |
| */ | |
| public static function isValidAcn($acn){ | |
| $weights = array(8, 7, 6, 5, 4, 3, 2, 1, 0); | |
| // Strip non-numbers from the acn | |
| $acn = preg_replace('/[^0-9]/', '', $acn); | |
| // Check acn is 9 chars long | |
| if(strlen($acn) != 9) { | |
| return false; | |
| } | |
| // Sum the products | |
| $sum = 0; | |
| foreach(str_split($acn) as $key => $digit) { | |
| $sum += $digit * $weights[$key]; | |
| } | |
| // Get the remainder | |
| $remainder = $sum % 10; | |
| // Get remainder compliment | |
| $complement = (string)(10 - $remainder); | |
| // If complement is 10, set to 0 | |
| if($complement === "10") { | |
| $complement = "0"; | |
| } | |
| return ($acn[8] === $complement); | |
| } | |
| } | |
| // Example Usage: | |
| // AbnValidator::isValidAbnOrAcn("44 706 210 937") | |
| // => true |
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The ABN format guide has since been moved to https://abr.business.gov.au/Help/AbnFormat