src/Randomizer.php
public function getValueByPowers(array $values, array $powers)
    {
        if (empty($values)
                || empty($powers)
                || \count($values) !== \count($powers)
        ) {
            throw new InvalidArgumentException('Empty parameter or count not equal');
        }

        // reindex arrays
        $values = \array_values($values);
        $powers = \array_values($powers);

        $rolledIndex = $this->getArrayKeyByPowers($powers);

        return $values[$rolledIndex];
    }
public function getValueByPowers(array $values, array $powers)
    {
        if (empty($values)
                || empty($powers)
                || \count($values) !== \count($powers)
        ) {
            throw new InvalidArgumentException('Empty parameter or count not equal');
        }

        // reindex arrays
        $values = \array_values($values);
        $powers = \array_values($powers);

        $rolledIndex = $this->getArrayKeyByPowers($powers);

        return $values[$rolledIndex];
    }
Returns an array value based on the "powers" of array values.
Arrays must be not empty and of equal sizes.

@param array $values Array of values to be returned.
@param array $powers Array of non-negative float values.
Each key's "power" means likeness of
the corresponding array value being returned.

@return mixed One of the values of the "values" array.