protected function MatchBase::binom in Password Strength 8.2

Calculate binomial coefficient (n choose k).

http://www.php.net/manual/en/ref.math.php#57895

Parameters

$n:

$k:

Return value

int

File

src/MatchBase.php, line 141

Class

MatchBase

Namespace

Drupal\password_strength

Code

protected function binom($n, $k) {
  $j = $res = 1;
  if ($k < 0 || $k > $n) {
    return 0;
  }
  if ($n - $k < $k) {
    $k = $n - $k;
  }
  while ($j <= $k) {
    $res *= $n--;
    $res /= $j++;
  }
  return $res;
}