ไม่สามารถทำให้ขึ้นแค่ TOP10 ได้ครับ มันจะขึ้น Warning: mysqli_fetch_assoc()

include('time.php');
$con=mysqli_connect("localhost","root","root","fbstatus");
mysqli_set_charset($con,'utf8');
	
	$sql = mysqli_query($con,"SELECT TOP 10 * FROM comments order by comment_id desc");
while($sql2 = mysqli_fetch_assoc($sql)){
	$r['comment'] = $sql2['comment'];
	$ide = $sql2['comment_id'];
	$text = nl2br($r['comment']);
	$um = $sql2['u_nm'];
	$ti = $sql2['time'];
	
	$post = mysqli_query($con,"SELECT * FROM comments  ");
	$post2 = mysqli_fetch_assoc($post);
	$ti1 = generate_date_today("d M Y H:i", ($ti-date('h:i:s')), "en", true);
	
	echo "";
	}

	
?>