MySQL - Connect error(1045)Access denied for user "root"@"localhost" (using password: YES)

$host = "localhost";

$user = "root";

$password = "";

$database = "marcadores";

function login($userName, $password1){

    global $host, $user, $password, $database;

    $db = mysqli_connect($host, $user, $password, $database);

    if(!$db){

        die("Connect error(".mysqli_connect_errno().")".mysqli_connect_error());

    }

    $consulta = "select * from user where nombre_usuario='$userName' and password_usuario='$password1'";

    $resultado = mysqli_query($db, $consulta);

    if(!$resultado){

        die("Error en mysqli_query.");

    }

    if(mysqli_num_rows($resultado)>0){

        return 1;

    }else{

        return 0;

    }

}