I'm trying to insert multiple array to mysql, but getting error like this

Message: Cannot use object of type CI_DB_mysqli_result as array

Filename: operator_pt/Wsmahasiswa.php

Line Number: 357

here my code from controller

$database1 = $username1 . '_' . $token . '_' . $temphmspt;
$table1 = 'mahasiswa';
$data1 = $this->db->query("select nm_pd from $database1");
foreach ($data1->result() as $key1) {
    $filter1 = "nm_pd like '$key1->nm_pd'";
    $order1 = "nm_pd asc";
    $limit1 = 10;
    $offset1 = 0;
    $tampan1 = $proxy->GetRecordset($token, $table1, $filter1, $order1, $limit1, $offset1);
    $tampan1 = $data1;
    $insert = $this->db->replace($database, $data1["result"]); //line 357
}

here arrays example

Array
(
    [error_code] => 0
    [error_desc] => 
    [result] => Array
        (
            [0] => Array
                (
                    [id_pd] => cb5ab906-a9b5-49f2-95e9-0d30ce005bd9
                    [nm_pd] => BABABA
                    
                )

            [1] => Array
                (
                    [id_pd] => f29128c2-27a0-4300-a4f5-842573e9e804
                    [nm_pd] => BIBIBI
                    
                )

        )

)
Array
(
    [error_code] => 0
    [error_desc] => 
    [result] => Array
        (
            [0] => Array
                (
                    [id_pd] => 70500b08-a285-4e97-af0c-e8e43d2e5be6
                    [nm_pd] => BUBUBU
                    
                )