Preserve line breaks in textarea

Question

I have a form with a textarea and I want to preserve line breaks entered by the user when outputting the content.

For exemple, if I write in textarea :

Answer 1

You keep output in textarea as it is. You would receive input as a string output that string(write to file) that string adding textarea to the input string.

for eg.
". $txt ."";
$file = fopen("file.html","a+");
fwrite($file, $txt1);
fclose($file);
?>