Saving category ID in global variable

  • Hello,

    I’m having a problem and don’t know much about PHP.
    I’m having a category page that shows a list of posts in multiple subcategories. I can navigate between the subcategories (always getting a new filtered list of posts) using this code.

    https://pastebin.com/P530ewUg

    But if I click on one post, I would like to open that post, but keep the filtered list of posts I had before. But WP kind of loses the value for the subcategory and doesn’t remember the subcategory i selected before.

    Is there any way to save that ID in a global variable?

    Would be very happy for any help!!!
    Thanks, Karina

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