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<?php |
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namespace Z38\SwissPayment; |
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/** |
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* IBAN |
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*/ |
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class IBAN |
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{ |
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const MAX_LENGTH = 34; |
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const PATTERN = '/^[A-Z]{2,2}[0-9]{2,2}[A-Z0-9]{1,30}$/'; |
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/** |
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* @var string |
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*/ |
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protected $iban; |
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/** |
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* Constructor |
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* |
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* @param string $iban |
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* |
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* @throws \InvalidArgumentException When the IBAN does contain invalid characters or the checksum calculation fails. |
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*/ |
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public function __construct($iban) |
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{ |
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$cleanedIban = str_replace(' ', '', strtoupper($iban)); |
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if (!preg_match(self::PATTERN, $cleanedIban)) { |
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throw new \InvalidArgumentException('IBAN is not properly formatted.'); |
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} |
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if (!self::check($cleanedIban)) { |
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throw new \InvalidArgumentException('IBAN has an invalid checksum.'); |
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} |
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$this->iban = $cleanedIban; |
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} |
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/** |
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* Format the IBAN either in a human-readable manner |
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* |
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* @return string The formatted IBAN |
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*/ |
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public function format() |
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{ |
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$parts = str_split($this->iban, 4); |
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return implode(' ', $parts); |
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} |
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/** |
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* Normalize the IBAN |
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* |
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* @return string The normalized IBAN |
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*/ |
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public function normalize() |
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{ |
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return $this->iban; |
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} |
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/** |
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* Gets the country |
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* |
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* @return string A ISO 3166-1 alpha-2 country code |
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*/ |
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public function getCountry() |
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{ |
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return substr($this->iban, 0, 2); |
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} |
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/** |
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* Checks whether the checksum of an IBAN is correct |
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* |
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* @param string $iban |
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* |
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* @return bool true if checksum is correct, false otherwise |
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*/ |
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protected static function check($iban) |
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{ |
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$chars = str_split(substr($iban, 4).substr($iban, 0, 4)); |
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$length = count($chars); |
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for ($i = 0; $i < $length; $i++) { |
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$code = ord($chars[$i]); |
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if ($code >= 65 && $code <= 90) { // A-Z |
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$chars[$i] = $code - 65 + 10; |
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} |
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} |
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$prepared = implode($chars); |
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$r = ''; |
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$rLength = 0; |
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$i = 0; |
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$length = strlen($prepared); |
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while ($i < $length) { |
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$d = $r.substr($prepared, $i, 9 - $rLength); |
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$i += 9 - $rLength; |
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$r = $d % 97; |
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$rLength = 1 + ($r >= 10); |
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} |
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return ($r == 1); |
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} |
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/** |
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* Returns a string representation. |
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* |
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* @return string The string representation. |
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*/ |
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public function __toString() |
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{ |
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return $this->format(); |
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} |
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} |
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z38 /
swiss-payment
