/**
* Uses the provided seconds and micro-seconds to calculate the time_low,
* time_mid, and time_high fields used by RFC 4122 version 1 UUIDs
*
* @param string $seconds
* @param string $microSeconds
* @return string[] An array containing `low`, `mid`, and `high` keys
* @link http://tools.ietf.org/html/rfc4122#section-4.2.2
*/
public function calculateTime($seconds, $microSeconds)
{
$uuidTime = new BigNumber('0');
$sec = new BigNumber($seconds);
$sec->multiply('10000000');
$usec = new BigNumber($microSeconds);
$usec->multiply('10');
$uuidTime->add($sec)->add($usec)->add('122192928000000000');
$uuidTimeHex = sprintf('%016s', $uuidTime->convertToBase(16));
return array('low' => substr($uuidTimeHex, 8), 'mid' => substr($uuidTimeHex, 4, 4), 'hi' => substr($uuidTimeHex, 0, 4));
}
/**
* Transforms a given string to a (big) number, based on the set alphabet.
*
* @param string $string
*
* @return BigNumber
*/
private function stringToNum($string)
{
$number = new BigNumber(0);
foreach (str_split(strrev($string)) as $char) {
$number->multiply($this->alphabetLength)->add(array_search($char, $this->alphabet, false));
}
return $number;
}
