$sala = $_POST['sala'];

$servername = "";
$username = "";
$password = "";
$dbname = "";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} else{
    echo "Polaczono";
}

$sql = "INSERT INTO instructions (hash, sala)
VALUES ('$newfilename', '$sala')";

if ($conn->query($sql) === TRUE) {
    echo "Dane dodano prawidłowo";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();