Multiple category support and category negation for get_posts()

[markjaquith]

Would be really nice to have multiple category support and category negation support for the get_posts() function.

suggested by kapowaz

[drac]

patch attached.

maintains compatibility with existing syntax for get_posts; but any category can now be negated by prefixing with $negation_char (I defined it as ^{, but it can be changed easily).
get_posts(numberposts=10&offset=0&category=}3')

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multiple categories are also supported with the parse_str array syntax
get_posts(numberposts=10&offset=0&category[]=1+2+3')

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Any category/categories in the array syntax can be negated individually.
get_posts(numberposts=10&offset=0&category[]=1+^{2+3) asks for 1, 3 and negates 2. Can't think of a use for this yet though.}

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Didn't want to change the function signature, but I would like to resubmit this patch with an additional negateall parameter. False by default, this would allow a list of category ids to be marked as negated without prefixing each cat_id with the $negation_char. comments ?

[Nazgul]

This ticket has had no real activity for over 2 years, so closing as invalid for now.

Feel free to re-open if you have additional patches/information/suggestions/...