Обработка данных из БД

$sg_pmd = mysql_query("SELECT * FROM pmessages WHERE pmessage_to='$user_id'"); // Selecting personal messages data
$sd_pmd = mysql_fetch_assoc($sg_pmd); // Selected personal messages data
if (empty($sd_pmd)){
echo "Cообщений нет.";
}
else {
while ($sd_pmd = mysql_fetch_assoc($sg_pmd)){
    
$user_comment = $sd_pmd["pmessage_text"];
$comment_author = $sd_pmd["pmessage_to"];
$comment_date = $sd_pmd["pmessage_time"];
$comment_user_id = $sd_pmd["pmessage_from"];
 
switch ($comment_user_id){
    case 1:
    $pmessage_author_name = "Александр";
    break;
    case 2:
    $pmessage_author_name = "Андрей";
    break;
    case 3:
    $pmessage_author_name = "Никита";
    break;
    case 4:
    $pmessage_author_name = "Гияс";
    break;
    case 5:
    $pmessage_author_name = "Юра";
    break;
    case 6:
    $pmessage_author_name = "Максим";
    break;
    case 7:
    $pmessage_author_name = "Павел";
    break;
    case 8:
    $pmessage_author_name = "Илья";
    break;
    case 9:
    $pmessage_author_name = "Тестер";
    break;
}
print <<<END
<p>
<div class='pmessage_from'>
$user_comment
<div class='small_text'>
<a href='user.php?id=$comment_user_id' title='Перейти на страницу пользователя' id='pmessage_link'>$pmessage_author_name</a>, $comment_date
</div>
</div>
</p>
END;
}
}

$sender_id = 0;
 
$result = mysql_query("SELECT * FROM pmessages WHERE pmessage_from=$sender_id;");
 
while( $pmessage_from = mysql_fetch_assoc($result) ) {
    
    echo $pmessage_from['pmessage_text'].' | '.$pmessage_from['pmessage_to'].' | '.$pmessage_from['pmessage_time'].'<br>';
}

$sender_id = intval($sender_id);