Newline doesn't work for some reason?

The \n I write out to an open file does not work
the second time:

$xmlstr = "<?xml version=\"1.0\"\x3F>\n";
$songstr = "<songs>\n";

fwrite($handle, "$xmlstr"); //after this I got a new line
fwrite($handle, "$songstr"); //but not after this

$lines = file("./clips/$file_name");
foreach ($lines as $line_num => $line) {

fwrite($handle, " <song path=\"$line");
}

The output:

<?xml version="1.0"?>
<songs> <song path="http://209.245.59.124/song.mp3

Should be:

<?xml version="1.0"?>
<songs>
<song path="http://209.245.59.124/song.mp3


How come??

Ralph