Pass Category ID from one page to the next

  • Hello!

    On a custom-post-type overview page (category.php) I can select between different categories so posts in a specific category i shown.

    When entering a post page (content-single.php) I would like also to display a list of posts from the same catagory that the user just selected on the previous page. Like related posts.

    I thought one way could be with a global variable, but I′m stuck. Can′t figure out how to get the Cat_ID passed over. This is what I got. Any help will be much appreciated.

    In the category.php I have:

    $catname = single_cat_title( '', false );
global $category_id;
$category_id = get_cat_ID($catname);

    In the content-single.php is this. But no number is printed.

    <?php global $category_id; echo $category_id; ?>

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