Create Helper function in CodeIgniter

Create Helper function in Codeigniter
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if(!function_exists('sqlRecordsCount')){
function sqlRecordsCount(){
$ci1 =& get_instance();

           // Get Connection of Another Database Defined

   $db2 = $ci1->load->database('otherdb', TRUE);
 

            $query = "SELECT book_id from books";
$query = $db2->query($query);

// echo $db2->last_query();
$result = $query->result_array();
return $result;

}

}

print_r($sqlRecordsCount());