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show_source [PHP]

The following iframe ... 
<iframe src='/php/show_source.php'>
</iframe>
... is literally followed now:
The php file (/php/show_source.php) content is: 
Going to call <b>show_source</b>:
<?php
  show_source($_SERVER['DOCUMENT_ROOT'] . $_SERVER['PHP_SELF']);
  print "<p>show_source called";
?>