dozent_get_course_id_by_content_id( $content_ID )
Source
File: includes/core-functions.php
function dozent_get_course_id_by_content_id( $content_ID = 0 ) {
$content_ID = dozent_get_post_id( $content_ID );
return get_post_meta( $content_ID, '_dozent_course_id', true );
}