show posts which are in all the selected categories (1 post)

  1. OperaManiac
    Posted 9 years ago #

    Three drop downs with selected categories and a go button.

    the result should be posts which have all the three selected categories.

    i tried ?cat=x&cat=y&cat=z

    but it would show posts which can have either of the three categories or two or all of them. i need to show the posts which have all the three categories in them.

    any ideas!

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