function get_unavailabities($sql) {
include 'connect.php';
$id = $_GET['id'];
$select = $conn->prepare($sql);
$select->bind_param('s', $id);
$select->execute();
$select->store_result();
if ($select->num_rows > 0) {
    echo "<table>n
            <tr>n
                <th>Date</th>n
                <th>Delete</th>n
            </tr>n";
    $meta = $select->result_metadata();
    while ($field = $meta->fetch_field()) {
        $params[] = &$row[$field->name];
    }
    call_user_func_array(array($select, 'bind_result'), $params);
    while ($select->fetch()) {
        $date_from = new DateTime($row['dates']);
        $from_date = $date_from->format('d/m/Y');

        echo "<tr>n
                <td>".$from_date."</td>n
                <td><a href='includes/delete.php?dates=".$row['dates']."&apartment=".$row['apartmentID']."'>Delete</a></td>
            <tr>n";
    }
    echo "</table>n";
    $select->close();
}

}

<table>
             <tr>
             <th>Date</th>
                <th>Delete</th>
            </tr>
            <tr>
                <td>03/09/2015</td>
                <td><a href='includes/delete.php?dates=2015-09-03&apartment=1'>Delete</a></td>
            <tr>
            <tr>
                <td>04/09/2015</td>
                <td><a href='includes/delete.php?dates=2015-09-04&apartment=1'>Delete</a></td>
            <tr>
            <tr>
                <td>05/09/2015</td>
                <td><a href='includes/delete.php?dates=2015-09-05&apartment=1'>Delete</a></td>
            <tr>
            <tr>
                <td>09/09/2015</td>
                <td><a href='includes/delete.php?dates=2015-09-09&apartment=1'>Delete</a></td>
            <tr>
            </table>

if (isset($_GET['dates']) && isset($_GET['apartment'])) {
$dates = $_GET['dates'];
$apartment = $_GET['apartment'];

include 'connect.php';
$sql = "DELETE * FROM room_nights WHERE dates = '?' AND apartmentID = ?";
$delete = $conn->prepare($sql);
$delete->bind_param('ii', $dates, $apartment);
$delete->execute();

if ($delete->affected_rows > 0) {
    header('Location:../CMS-Apartments.php');
}
}