Dynamic variables binding in mysqli bind_param

When I try to below code it give me a warning

mysqli_stmt::bind_param(): Number of elements in type definition string doesn't match number of bind variables

$stmt = $mysqli->prepare('SELECT * FROM users WHERE lname = ? AND fname = ?');
    $type = "ss";
    $param = array("Maq","bool");
    $params[] = &$type;
    $params[] = &$param;

    call_user_func_array( array($stmt, 'bind_param'), $params );

I really don’t know why its happening I read a lot of same title questions in Stack Overflow but some has comma separated types or need more type but in my case I think its proper but why I am keep getting warnings?

Answer

$stmt = $mysqli->prepare('SELECT * FROM users WHERE lname = ? AND fname = ?');
$stmt->bind_param('ss', $param[0], $param[1]);
$stmt->execute();

//other version
$stmt = $mysqli->prepare('SELECT * FROM users WHERE lname = ? AND fname = ?');
$type = "ss";
$names = array("Maq", "bool");
$params = array(&$type, &$names[0], &$names[1]);

call_user_func_array(array($stmt, 'bind_param'), $params);