preg_match_all（/（\\\
）/，$ text，$ matches）; $ p $

  preg_match_all 
 $ count = count（$ matches [0]）+ 1; // +1为最后的齿

编辑：由于您使用nl2br所以' \\\
'被替换为< br> 。所以你需要这个代码。

  preg_match_all（/（< br>）/，$ text，$火柴）; 
 $ count = count（$ matches [0]）+ 1; // $为最后的齿

然而，< br> 不会在textarea中显示为换行符（如果我没有记错的话），因此您可能需要删除 nl2br 。

希望这有助于。

I have a textarea submitted to a php file.

Im using this to make it look exactly as the user entered the text:

 $ad_text=nl2br(wordwrap($_POST['annonsera_text'], 47, "\n", true));

If I want to resize a container I must be able to read how many lines are in the variable '$ad_text'.

Is there a way to do this...

I am still learning so thanks for your help...

You can use regular expression:

preg_match_all("/(\n)/", $text, $matches);
$count = count($matches[0]) + 1; // +1 for the last tine

EDIT: Since you use nl2br so '\n' is replaced by <br>. So you need this code.

preg_match_all("/(<br>)/", $text, $matches);
$count = count($matches[0]) + 1; // +1 for the last tine

However, <br> will not be display as newline in textarea (if I remember correctly) so you may need to remove nl2br.

Hope this helps.