Capture newline from a textarea input
Solution 1:
Try nl2br() instead:
echo nl2br($str);
Solution 2:
The newlines should be included in the string that you get from $_POST["field"]. However, if you then use that string as output in HTML, newlines will be treated as whitespace. To force the line breaks, use preg_replace("/\n/", "<br />", $str).