Description:
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I frequently use php.net (the mirrors provided to me are usually us2.php.net or us3.php.net and both of those share this bug) for function reference when programming. On Windows XP SP2, my web browser is Mozilla Firefox 1.5.0.1 (and I was also able to reproduce this bug in Internet Explorer 6.0). When I go to any of the pages in the documentation (especially in the function list), I see mostly readable text, but there are always some characters that do not print. Instead, I see either a diamond-with-a-question-mark, a question mark, or even Greek and Chinese characters. This is annoying and sometimes it interferes with the meaning of the page (see example).

Reproduce code:
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Point Firefox 1.5.0.1 or Internet Explorer 6.0 to http://us3.php.net/manual/hk/ref.http.php
(or    us2)

Expected result:
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Reference about the HTTP Functions provided by PHP

Actual result:
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XXXIX.HTTP Functions
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These functions let you manipulate the output sent back to the remote browser right down to the HTTP protocol level.
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header -- Send a raw HTTP header
headers_list -- Returns a list of response headers sent (or ready to send)