php - Removing blank lines from a textarea's output

Question

I get data from a textarea where a user has to enter a name one on each line. That data later gets split at the carriage return. Sometimes a user may add blank lines intentionally. How can I detect these lines and delete them? I'm using PHP. I dont mind using a regexp or anything else.

Incorrect Data

Matthew
Mark
Luke

John

James

Correct Data (Note blank lines removed)

Matthew
Mark
Luke
John
James

Answer 1

Using regex to eliminate blank lines before exploding (works well for any number of consecutive blank lines, also see next snippet):

$text = preg_replace('/
+/', "
", trim($_POST['textarea']));

Splitting with a regex:

$lines = preg_split('/
+/', trim($_POST['textarea']));
$text = implode("
", $lines);

Splitting without a regex:

$lines = array_filter(explode("
", trim($_POST['textarea'])));
$text = implode("
", $lines);

Just feeling a tad creative today, pick your poison :)