medoo::inner_conjunct PHP Method

    protected function inner_conjunct($data, $conjunctor, $outer_conjunctor)
    {
        $haystack = array();
        foreach ($data as $value) {
            $haystack[] = '(' . $this->data_implode($value, $conjunctor) . ')';
        }
        return implode($outer_conjunctor . ' ', $haystack);
    }