Intelligent Back Button.

/ Published in: PHP
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A back button that detects if the visitor came from your site initially. If they came from another URL it sends them to your index page instead.

Copy this code and paste it in your HTML
  1. <?php $mysite = ""; ?>
  2. <a href="<?php $url = parse_url($_SERVER['HTTP_REFERER']); /* detect referrer */
  3. if ($url['host'] == $_SERVER['HTTP_HOST']) { /* if domain matches, go back */
  4. echo $_SERVER['HTTP_REFERER']; } else { echo $mysite; } ?>"><!-- if from another domain, send them to my index page -->Back a page</a>

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