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I have a foreach-loop that looks like this

foreach($selected_courses as $postid) {
            $course = new WP_Post($postid);
}

where $selected_courses is an array of ids based on a form submit. For each id I create a post-object (which is a custom post type course)

Is there any good/fast way to retrieve the parent custom taxonomy of this course? (I don't create another loop for this if it is not neccessary)

(I have custom post types courses which are related to custom taxonomy categorycourses)

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