Select Multipla

[satifal]

<?php
if (isset($_POST['nazioni'])) {
    $nazioni = $_POST['nazioni'];
    foreach ($nazioni as $nazione) {
        echo $nazione."
";
    }
}
?>

<form name="eventi" method="post" action="index.php">
    <select multiple="multiple" size="5" name="nazioni[]">
        <option value="1">Italia</option>
        <option value="2">Francia</option>
        <option value="3">Spagna</option>
    </select>
    <input type="submit" name="submit" value="submit" />
</form>