Reliably Remove Newlines From String

Question

The string input comes from textarea where users are supposed to enter every single item on a new line.

When processing the form, it is easy to explode the textarea

Answer 1

Following code must do the job

$string) {
    $split[$k] = trim($string);
    if (empty($split[$k]))
    unset($split[$k]);
}
ksort($split);
$join = implode('', $split);
?>

to get string with newlinews completely stripped. It won't work correctly with JS though :(