PHP SQL $ stmt-> fetch（）将数组推送到另一个数组中

I have some problems with $stmt->fetch()

I have a variable called $row which consists of $row['id'] and $row['name']. In the $stmt->fetch() loop I want to append the row to a $result array. But if print the $result array it only consists out of the last row.

Here is my code:

function queryResult($sql, $params, $columNames) {

    $result = [];
    $row = [];
    $bindVars = [];

    for ($i = 0; $i < sizeof($columNames); $i++) {
        $bindVars[] = &$row[$columNames[$i]];
    }

    $stmt = $this->query($sql, $params);
    call_user_func_array([$stmt, 'bind_result'], $bindVars);

    while ($stmt->fetch()) {
        print_r($row);
        echo '<br>';
        array_push($result, $row);
        print_r($result);
        echo '<br><br>';
    }

    return $result;

}

And this is the result:

Array ( [id] => 2 [name] => Test2 ) 
Array ( [0] => Array ( [id] => 2 [name] => Test2 ) ) 

Array ( [id] => 3 [name] => Test3 ) 
Array ( [0] => Array ( [id] => 3 [name] => Test3 ) [1] => Array ( [id] => 3 [name] => Test3 ) ) 

In line 14 I think while($row=mysqli_fetch_array($stmt)) should be used.