MemberPress: Unenrolled Course Shortcode

add_shortcode('mpcs-unenrolled-courses', function() {

  $unenrolled_courses = array();

  $current_user = MeprUtils::get_currentuserinfo();

  $mepr_user = new MeprUser( $current_user->ID );

  $courses = get_posts( array(

    'post_type' => 'mpcs-course',

    'post_status' => 'publish',

    'posts_per_page' => '-1',

    'orderby' => 'title',

    'order' => 'ASC'

  ));

  if (false == MeprUtils::is_logged_in_and_an_admin()) {

    $courses = array_filter( $courses, function( $course ) use ( $mepr_user ) {

      return true == \MeprRule::is_locked_for_user( $mepr_user, $course );

    });

  }

  $courses_ids = array_map( function( $c ) {

    return is_object( $c ) ? $c->ID : $c['ID'];

  }, $courses );

  if (empty($courses_ids)) {

    $courses_ids = array(0);

  }

  $course_query = new \WP_Query(array(

    'post_type' => 'mpcs-course',

    'post_status' => 'publish',

    'posts_per_page' => '-1',

    'orderby' => 'post__in',

    'order' => 'ASC',

    'post__in' => $courses_ids

  ));

  $course_posts = $course_query->get_posts();

  foreach ($course_posts as $course) {

    $unenrolled_courses[] = $course;

  }

  $content = '<ul>';

  foreach ($unenrolled_courses as $course) {

    $content .= '<li><a href="' . get_the_permalink($course->ID) . '">' . $course->post_title . '</a></li>';

  }

  $content .= '</ul>'; // Close the list after loop

  return $content;

});