Adding a line break in PHP feed output


I am trying to edit a feed that is created for my blog extension. I want to place a line break after each tag (there is another problem with the feed and bugs are hard to find when it is all on one line) but I cannot get it to work. I have tried /n but this just outputs /n.

It is not echo so I am not sure this is correct to use. Here is the code

            $output  = '<?xml version="1.0" encoding="UTF-8" ?>';
            $output .= '<rss version="2.0" xmlns:atom="">';

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I have tried

            $output  = '<?xml version="1.0" encoding="UTF-8" ?> /n';
            $output .= '<rss version="2.0" xmlns:atom=""> /n';

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this just outputs

<?xml version="1.0" encoding="UTF-8" ?>/n<rss version="2.0" xmlns:atom=""> /n

I have also tried

            $output  = '<?xml version="1.0" encoding="UTF-8" ?>';
			$output  = "\n";
            $output .= '<rss version="2.0" xmlns:atom="">';
			$output  = "\n";

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This makes these lines disappear and replaced with a single line break.

Can someone please give me some advice?

Many Thanks
Adam JonesAsked:
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Your second code sample was closest, but it should be:
$output  .= "\n";

The .= operator means append / concatenate

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Adam JonesAuthor Commented:
Thanks. Worked perfectly.
Ray PaseurCommented:
Just a note for going forward, some OS do not use \n for the end-of-line character.  PHP has a context-aware, future-proof, end-of-line character available in a predefined constant: PHP_EOL
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