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