PersonalNumber.php

<?php


/**
 * Class PersonalNumber
 *
 * @TODO calculate age?
 */
class PersonalNumber
{
	/**
	 * @var int
	 */
	protected $personalNumber = 0;

	/**
	 * @var int
	 *
	 * 1 is woman, 2 is man
	 */
	protected $gender = 0;

	/**
	 * @var int
	 */
	protected $isValid = 0;

	/**
	 * @var int
	 *
	 * mostly used for immigrants as a temporary personal number
	 * a D-number adds 4 to the first digit
	 */
	protected $isDNumber = 0;

	/**
	 * @var int
	 *
	 * used (mostly) in health care for patient journals
	 * a H-number adds 4 to the third digit
	 */
	protected $isHNumber = 0;


	/**
	 * Check the validity of a personal number
	 *
	 * This function does not check if the personal number actually exists
	 *
	 * @param $personalNumber
	 * @return mixed
	 */
	public function checkPersonalNumber($personalNumber) {
		$this->personalNumber = $personalNumber;

		// return false if $personalNumber is empty
		if ( empty($personalNumber)) return false;

		// remove values that are not numbers
		$personalNumber = preg_replace('/[^0-9]/', '', $personalNumber);

		// control check k1
		$k1 = (3*$personalNumber[0] + 7*$personalNumber[1] + 6*$personalNumber[2] + 1*$personalNumber[3] + 8*$personalNumber[4] + 9*$personalNumber[5] + 4*$personalNumber[6] + 5*$personalNumber[7] + 2*$personalNumber[8]) % 11;
		$k1 = ($k1 == "0") ? 0 : 11-$k1;

		// control check k2
		$k2 = (5*$personalNumber[0] + 4*$personalNumber[1] + 3*$personalNumber[2] + 2*$personalNumber[3] + 7*$personalNumber[4] + 6*$personalNumber[5] + 5*$personalNumber[6] + 4*$personalNumber[7] + 3*$personalNumber[8] + 2*$k1) % 11;

		$k2 = ($k2 == "0") ? 0 : 11-$k2;

		// check if it is now just numbers, contains 11 digits and is a valid personal number
		if ( (preg_match('#[^0-9]#', $personalNumber)) || (strlen($personalNumber) != 11) || (($k1 != $personalNumber[9]) || ($k2 != $personalNumber[10])) ) return false;

		// if we got this far, the personal number is valid
		$this->isValid = true;

		// set gender value
		$this->gender = (($personalNumber[8] % 2) == 0) ? "1" : "2";

		// is this a D-number?
		$this->isDNumber = ($personalNumber[0] > 3) ? $personalNumber[0] - 4 : $personalNumber[0];

		// is this a H-number?
		$this->isHNumber = ($personalNumber[2] > 1) ? $personalNumber[2] - 4 : $personalNumber[2];

		// we've made it! Now we can return true
		return true;
	}
}