226      * @param array $y_value
230     protected static function addHelper(array $x_value, $x_negative, array $y_value, $y_negative)  argument
233         $y_size = count($y_value);
237                 self::VALUE => $y_value,
249             if ($x_value == $y_value) {
256             $temp = self::subtractHelper($x_value, false, $y_value, false);
257             $temp[self::SIGN] = self::compareHelper($x_value, false, $y_value, false) > 0 ?
265             $value = $y_value;
276 …   $sum = ($x_value[$j] + $y_value[$j]) * static::BASE_FULL + $x_value[$i] + $y_value[$i] + $carry;
287             $sum = $x_value[$i] + $y_value[$i] + $carry;
311      * @param array $y_value
315     public static function subtractHelper(array $x_value, $x_negative, array $y_value, $y_negative)  argument
318         $y_size = count($y_value);
322                 self::VALUE => $y_value,
334             $temp = self::addHelper($x_value, false, $y_value, false);
340         $diff = self::compareHelper($x_value, $x_negative, $y_value, $y_negative);
352             $x_value = $y_value;
353             $y_value = $temp;
358             $y_size = count($y_value);
365 …   $sum = ($x_value[$j] - $y_value[$j]) * static::BASE_FULL + $x_value[$i] - $y_value[$i] - $carry;
377             $sum = $x_value[$i] - $y_value[$i] - $carry;
401      * @param array $y_value
405 … protected static function multiplyHelper(array $x_value, $x_negative, array $y_value, $y_negative)  argument
415         $y_length = count($y_value);
426                 self::trim(self::regularMultiply($x_value, $y_value)) :
427                 self::trim(self::karatsuba($x_value, $y_value)),
439      * @param array $y_value
442     private static function karatsuba(array $x_value, array $y_value)  argument
444         $m = min(count($x_value) >> 1, count($y_value) >> 1);
447             return self::regularMultiply($x_value, $y_value);
452         $y1 = array_slice($y_value, $m);
453         $y0 = array_slice($y_value, 0, $m);
479      * @param array $y_value
482     protected static function regularMultiply(array $x_value, array $y_value)  argument
485         $y_length = count($y_value);
501             $temp = $x_value[$j] * $y_value[0] + $carry; // $product_value[$k] == 0
514                 $temp = $product_value[$k] + $x_value[$j] * $y_value[$i] + $carry;
581         $y_value = &$y->value;
605         $temp_value = array_merge(self::array_repeat(0, $x_max - $y_max), $y_value);
622                 $y_value[$y_max],
623                 ($y_max > 0) ? $y_value[$y_max - 1] : 0
661                 $temp_value = array_merge($adjust, $y_value);
786      * @param array $y_value
791 …  protected static function compareHelper(array $x_value, $x_negative, array $y_value, $y_negative)  argument
799         if (count($x_value) != count($y_value)) {
800             return (count($x_value) > count($y_value)) ? $result : -$result;
802         $size = max(count($x_value), count($y_value));
805         $y_value = array_pad($y_value, $size, 0);
808             if ($x_value[$i] != $y_value[$i]) {
809                 return ($x_value[$i] > $y_value[$i]) ? $result : -$result;