Description:
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According to RFC3986, which I beleive to be the latest in a long line of RFCs on URI syntaxt, it is illegal to use square brackets in the search string.

There is a comment on the PHP manual page for rawurlencode that states that these are now permitted but extensive RFC reading and googling fails to back this up for me.

From what I can gather they should be encoded as %5B and %5D.

Here is the pseudo fix: str_replace(array('[',']'), array('%5B','%5D'), http_build_query(array('hello' => array('interesting','eh'))))

The fix is quite simple and some small changes need to be made to http.c - I've not got a patch unfortunatly, but it should only take a short while to fix and would probably take just as long as a patch review ;)

Reproduce code:
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echo http_build_query(array('hello' => array('interesting','eh')))."\n";

Expected result:
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hello%5B0%5D=interesting&hello%5B1%5D=eh

Actual result:
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hello[0]=interesting&hello[1]=eh