Description:
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I've noticed that in your documentation code there are occurances of hex values. For example on http://us.php.net/utf8_encode at the top there is a 2b5e. We had a very similar problem on our www machine after we upgraded to Apache 2, and it was because in our code at the top we had the following line.

header('HTTP/1.1 200 OK');

When this line was removed the problem vanished. According to google twas something about chunked data. (the hex values reflect the size of the "chunk" being sent to the browser).

This isn't a critical problem, but if anyone ever tries to solve the problem I hope this may save them some head bashing.

Reproduce code:
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header('HTTP/1.1 200 OK');

Expected result:
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On an Apache 1.3 server nothing untoward happened (not sure what configuration changes may have prompted things though)

Actual result:
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After Apache 2 upgrade the text intruders appeared