PHP - Warning: mysqli::__construct(): (HY000/1045): Access denied for user "yo"@"localhost" (using passwor

<?php

$hn = '127.0.0.1';

$db = 'tarea';

$un = 'yo';

$pw = '123';

?>

<?php

require_once 'login.php';

$conn = new mysqli($hn, $un, $pw, $db);

if ($conn->connect_error)

	mysql_fatal_error();

die($conn->conect_error);

function mysql_fatal_error(){

	echo <<<_END

	<h3 style="color:red;">lo sentimos no podemos procesar el archivo.</h3>

	<p>por favor regresa a la pagina anterior.<br>si experimentas

	mas errores por favor envia un correo a: <a href="mailto:admin@server.com">

	soporte tecnico</a>. gracias!</p>

_END;

}

?>

<?php

require_once 'login.php';

	$conn = new mysqli($hn, $un, $pw, $db);

if ($conn->connect_error){

	die($conn->connect_error);

}

$_query = "SELECT * FROM db_tarea";

$result = $conn->query($_query);

if (!$result){

	die($conn->error);

}

$rows = $result->num_rows;

for ($j = 0; $j < $rows; ++$j){

	$result->data_seek($j);

	$row = $result->fetch_array(MYSQLI_ASSOC);

	echo 'Folio: '.$row['id'].'<br>';

	echo 'Nombre alumno: '.$row['nombre'].'<br>';

	echo 'Correo: '.$row['correo'].'<br>';

	echo 'Telefono: '.$row['telefono'].'<br>';

	echo "-----------------<br><br>";

}

$result->close();

$conn->close();

?>