Description:
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From manual page: http://www.php.net/reserved.variables.server#Indices
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The page states that PHP_SELF contains "The filename of the currently executing script", but it actually contains all of the request path, which makes it open for HTML injection.

This is by design, but as PHP_SELF is widely used for FORM submission, I think a security warning would be appropriate.


Test script:
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If a page contains
  <form action="<?php echo $_SERVER['PHP_SELF']; ?>">

-and the page is called with:
index.php/"><script>alert('Injection');</script><

The script is injected to the page.

Expected result:
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The behavior is by design - I just think the documentation should contain a warning on the issue.