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<?php |
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namespace Brazanation\Documents; |
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final class Modulo11 |
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{ |
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/** |
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* Number of digits to be calculated. |
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* @var int |
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*/ |
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protected $digitsCount; |
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/** |
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* Max size of factor. |
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* @var int |
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*/ |
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protected $maxMultiplier; |
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/** |
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* When calculated digit is equals 10 it will be converted to X. |
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* @var bool |
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*/ |
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private $convertX; |
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/** |
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* Modulo11 constructor. |
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* |
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* @param int $numberOfDigits Number of digits to be calculated. |
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* @param int $multiplierLimit Max size of factor. |
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* @param bool $convertX When calculated digit is equals 10 it will be converted to X. |
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*/ |
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public function __construct($numberOfDigits, $multiplierLimit, $convertX = true) |
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{ |
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assert(is_int($numberOfDigits), 'Number of digits must be integer'); |
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assert(is_int($multiplierLimit), 'Number of digits must be integer'); |
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$this->digitsCount = (int) $numberOfDigits; |
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$this->maxMultiplier = (int) $multiplierLimit; |
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$this->convertX = $convertX; |
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} |
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/** |
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* Generic validation for many type of numbers. |
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* |
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* @param string $number A number to be validate. |
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* |
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* @return boolean |
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*/ |
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public function validate($number) |
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{ |
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$number = preg_replace('/[^\dX]/i', '', $number); |
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$baseNumber = substr($number, 0, (-1 * $this->digitsCount)); |
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$checkDigits = $this->calculateDigits($baseNumber); |
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$digits = substr($number, (-1 * $this->digitsCount)); |
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return ($digits === $checkDigits); |
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} |
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/** |
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* Calculates digits from base numbers (without last N digits). |
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* |
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* @param string $number Base number to be calculated. |
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* |
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* @return string Returns N calculated digits. |
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*/ |
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private function calculateDigits($number) |
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{ |
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$numberOfIterations = $this->digitsCount; |
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while (--$numberOfIterations >= 0) { |
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$digit = $this->calculateDigit($number); |
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$number .= $digit; |
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} |
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return substr($number, (-1 * $this->digitsCount)); |
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} |
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/** |
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* Calculates digit from base number (without last digit). |
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* |
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* @param string $number Base number to be calculated. |
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* |
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* @return string Returns a calculated digit. |
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*/ |
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private function calculateDigit($number) |
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{ |
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$sum = $this->calculate($number); |
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if ($this->convertX) { |
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return (($sum * 10) % 11) % 10; |
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} |
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$digit = $sum % 11; |
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if ($digit == 10) { |
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$digit = 'X'; |
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} |
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return $digit; |
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} |
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/** |
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* Apply factor in each base number and calculates the sum of their. |
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* |
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* @param string $baseNumber Base number (number without N digits) |
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* |
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* @return int Returns the sum of base numbers with factors applied. |
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*/ |
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protected function calculate($baseNumber) |
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{ |
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$coefficient = 2; |
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$digits = str_split(strrev($baseNumber)); |
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$sum = 0; |
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foreach ($digits as $digit) { |
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$sum += ($coefficient * intval($digit)); |
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if (++$coefficient > $this->maxMultiplier) { |
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$coefficient = 2; |
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} |
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} |
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return $sum; |
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} |
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} |
brazanation /
php-documents
