Getting posts via category__in

  • I would like to know if it is possible to use the category__in parameter in Worpress URLs. I would like to display only the posts that appear in 2 categories.

    I tried to accomplish that by calling the following URL: https://myWordpressUrl/?category__in=5+6
    But it is ignored by the WordPress engine.

    With tags this is working fine (https://myWordpressUrl/?tag=5+6 ) but not with categories. Does anybody know how this can be accomplished.

    Thankx for any hints and tips!

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