Компьютерные науки. Базы данных

<!DOCTYPE HTML>
<HTML>
<HEAD>
    <meta charset="UTF-8">
    <title>Новая страница</TITLE>
</HEAD>
<BODY>
<?
$host = "localhost";
$username = "root";
$password = "";
$database = "Goods";
/// Обработка POST
if (isset($_POST['id'])) {<br>    $db = new mysqli($host, $username, $password, $database);<br>    if ($db->connect_error) {<br>        die('error ' .<br>            $db->connect_errno . ' ' .<br>            $db->connect_error);<br>    }
    $id = $db->escape_string($_POST['id']);
    $query = "DELETE FROM goods where id='$id'";
    $result = $db->query($query);
    $db->close();
}
/// Обработка GET
if (isset($_GET['id'])) {<br>    $id = htmlentities($_GET['id']);<br>    echo "<h2>Удалить запись</h2><br><form method = 'POST'><br><p><br><input type='hidden' name='id' value='$id'/></p><br><input type = 'submit' value = 'Удалить'><br></form><br>";<br>}
?>
</BODY>
</HTML>