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PHP

Preview Workspace for PHP comes up blank?

I just submitted this to Team Tree House and was told that I have to put it on the forum. Please can someone kindly help me?

The full index.php code from their exercise program produced a blank page, so I just shortened it to:

<html> <ul> <?php define(“MAX_BADGES”, 20); For($counter=3; $counter <= MAX_BADGES; $counter++) { echo “<li>” . $counter . “</li>”; } ?> </ul> </html>

However, this also produces a blank Preview Workspace?

The Preview Workspace Viewer is
http://port-80-q3hs66jxgp.treehouse-app.com/

I have also tried http://port-80-q3hs66jxgp.treehouse-app.com/index.php

best regards,

Ian.