Sokil\Mongo\Operator::addToSetEach PHP Method

    public function addToSetEach($field, array $values)
    {
        // new field
        if (!isset($this->operators['$addToSet'][$field])) {
            $this->operators['$addToSet'][$field]['$each'] = $values;
            return $this;
        }
        // scalar value or array in existed field
        if (!is_array($this->operators['$addToSet'][$field]) || !isset($this->operators['$addToSet'][$field]['$each'])) {
            $this->operators['$addToSet'][$field] = array('$each' => array_merge(array($this->operators['$addToSet'][$field]), $values));
            return $this;
        }
        // field already $each
        $this->operators['$addToSet'][$field] = array('$each' => array_merge($this->operators['$addToSet'][$field]['$each'], $values));
        return $this;
    }