go back using php

go to previous page using php ,following code print a link to previous history page

Code:

<?php
  $previousurl = htmlspecialchars($_SERVER['HTTP_REFERER']);
  echo "<a href='$previousurl '>go back</a>";
?>

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M. S. Rakha, Ph.D.
Queen's University
Canada

Author: DrRakha
Mastermind

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