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I'm trying to collect a list of all categories used on posts. However, the following code only returns the first category. How could this be adapted to collect all categories, if the post has multiples?

$category = get_the_category();
$the_cats[] = $category[0]->term_id;

Ultimately, I would like to use the term_id list to show/hide HTML elements on the page, depending on the selection.

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Try this function

wp_get_post_categories()

Check more reference from here: https://developer.wordpress.org/reference/functions/wp_get_post_categories/

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  • Awesome. I've now got a working array. Thanks for the pointer... Jun 16 '16 at 11:48

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