PHP - Nl2br?

I have the following code, and for some reason the nl2br() function doesnt work anymore it did until i added the pred_replace part:

$topic = $_POST['topic'];
$message = $_POST['message'];
$board = $_POST['board'];

$topic = stripslashes($topic);
$message = stripslashes($message);
$board = stripslashes($board);

$topic = mysql_real_escape_string($topic);
$message = mysql_real_escape_string($message);
$board = mysql_real_escape_string($board);

$message = nl2br($message); 

        $message = preg_replace("/\[b\](.*)\[\/b\]/Usi", "<b>\\1</b>", $message);
        $message = preg_replace("/\[u\](.*)\[\/u\]/Usi", "<u>\\1</u>", $message);
        $message = preg_replace("/\[i\](.*)\[\/i\]/Usi", "<i>\\1</i>", $message);
        $message = preg_replace("/\[center\](.*)\[\/center\]/Usi", "<center>\\1</center>", $message);
        $message = preg_replace("/\[right\](.*)\[\/right\]/Usi", "<p align=right>\\1</p>", $message);
        $message = preg_replace("/\[url=http://(.*)\](.*)\[\/url\]/Usi", "<a href=\"\\1\">\\2</a>", $message);
        $message = preg_replace("/\[img=(.*)\]/Usi", "<img src=\"\\1\">", $message);
        $message = preg_replace("/\[profile=(.*)\](.*)\[\/profile\]/Usi", "<a href=\"index.php?step=profile&profile=\\1\">\\2</a>", $message);
        $message = preg_replace("/\[quote](.*)\[\/quote\]/Uis", "<div>Quote:</div><div style=\"border:solid 1px;\">\\1</div>", $message);

although im using nl2br, and \r\n in the code below, my results are still displaying;

result1,result2,result2

opposed to

result1
result2
result3

How can i change to this format?

$code = $_GET['postcode'];
$message = $_GET['message'];
$shortcode = substr($code,0,2);
$subject = "subject here";
$result = mysql_query("SELECT email FROM treesurgeons WHERE postcode like '%" . $shortcode . "%' ORDER BY companyName LIMIT 3")
or die(mysql_error());  
echo "<h2>Business Names:</h2>";
$number_of_results = mysql_num_rows($result);
$results_counter = 0;
if ($number_of_results != 0) 
{while ($array = mysql_fetch_array($result)) 
{$email = $array['email'];
$results_counter++;
if ($results_counter >= $number_of_results) {$to .= $email;} 
else {$to .= $email . ',';}}}
$headers = 'From: me@me.com' . "\r\n" .
    'Reply-To: me@me.com' . "\r\n" .
    'X-Mailer: PHP/' . phpversion();
$message .= "\r\n". $to ;
echo nl2br ($message);
mail( "$to", "$subject","$message", "$headers");
echo "<br>" . "Thank you for using our mail form.";
?></body></html>

Hi

I am trying to use the nl2br function like this

while ($row = mysqli_fetch_array($query)) {
//May need this later to output pictures   
//     $imageURL = 'upload/'.rawurlencode($row["filename"]);
  echo
  
   "  <div class='divTableRow'>
<div class='divTableCell'>{$row['User']} ;</div>
<div class='divTableCell'>nl2br({$row['CommentText']});</div>
</div>


    \n";
}

However the output just looks like the attached picture.

When I check in the sql db I can see the line breaks when doing a select * from Table ;