code to show referer in page and output results

Hello

Could someone help me out with some simple php code to display the http referer in a page.

I know how to detect it, but want to output the results to the page.

<?php echo $_SERVER['HTTP_REFERER']; ?>

Show the referer, and if referer is blank show message : referer is blank

I'll chuck $5 to who ever can help me out

Thanks

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