To ensure new lines are saved as 's, I use PHPs built-in nl2br() function.
Inside an article however which may have a mixture of content such as <pre> or <code> tags, you don't want new lines created inside the content of those tags.
Therefore, I suggest using the function below.
# Change <code> for <pre> if required
function codenl2br($string) {
$string = str_replace("n", "
", $string);
if (preg_match_all('/<code>(.*?)</code>/', $string, $match)) {
foreach ($match as $a) {
foreach ($a as $b) {
$string = str_replace('<code>' . $b . '</code>', "<code>" . str_replace("
", "", $b) . "</code>", $string);
}
}
}
return $string;
}