Ошибка в PHP - коде

$db = mysqli_connect("localhost","root","54825482","MyO");

$result = mysqli_query("SELECT id FROM users WHERE login = '$login'" ,$db) or die('Cann`t query '.mysql_error);

$db = mysqli_connect("localhost","root","54825482","MyO");

$result = mysqli_query($db,"SELECT id FROM users WHERE login = '$login'");

$db = mysqli_connect("localhost","root","54825482","MyO");
$sql = "SELECT id FROM users WHERE login = '$login'";
$result = mysqli_query($db, $sql);
if (!$result)  die('Can`t query '. mysql_error);

Процедурный стиль

mysqli_query ( mysqli $link , string $query [, int $resultmode MYSQLI_STORE_RESULT ] )

mysqli_query

$mysqli = new mysqli("localhost","root","54825482","MyO");
$result = $mysqli->query("SELECT id FROM users WHERE login = '$login'");