bp_learndash_get_users_certificates( string $user_id = '' )

function bp_learndash_get_users_certificates( $user_id = '' ) {
	if ( empty( $user_id ) ) {
		return false;
	}

	/**
	 * Course Certificate
	 **/
	$user_courses = ld_get_mycourses( $user_id, array() );
	$certificates = array();
	foreach ( $user_courses as $course_id ) {

		$certificateLink = learndash_get_course_certificate_link( $course_id, $user_id );
		$filename        = "Certificate.pdf";
		$course_title    = get_the_title( $course_id );
		$certificate_id  = learndash_get_setting( $course_id, 'certificate' );
		$image           = '';

		if ( ! empty( $certificate_id ) ) {
			$certificate_data = get_post( $certificate_id );
			$filename         = sanitize_file_name( $course_title ) . "-" . sanitize_file_name( $certificate_data->post_title ) . ".pdf";
			$image            = wp_get_attachment_url( get_post_thumbnail_id( $certificate_id ) );
		}

		$date = get_user_meta( $user_id, 'course_completed_' . $course_id, true );

		if ( ! empty( $certificateLink ) ) {
			$certificate           = new \stdClass();
			$certificate->ID       = $course_id;
			$certificate->link     = $certificateLink;
			$certificate->title    = get_the_title( $course_id );
			$certificate->filename = $filename;
			$certificate->date     = date_i18n( "Y-m-d h:i:s", $date );
			$certificate->time     = $date;
			$certificate->type     = 'course';
			$certificates[]        = $certificate;
		}
	}

	/**
	 * Quiz Certificate
	 **/
	$quizzes  = get_user_meta( $user_id, '_sfwd-quizzes', true );
	$quiz_ids = empty( $quizzes ) ? array() : wp_list_pluck( $quizzes, 'quiz' );
	if ( ! empty( $quiz_ids ) ) {
		$quiz_total_query_args = array(
			'post_type' => 'sfwd-quiz',
			'fields'    => 'ids',
			'orderby'   => 'title', //$atts['quiz_orderby'],
			'order'     => 'ASC', //$atts['quiz_order'],
			'nopaging'  => true,
			'post__in'  => $quiz_ids
		);
		$quiz_query            = new \WP_Query( $quiz_total_query_args );
		$quizzes_tmp           = array();
		foreach ( $quiz_query->posts as $post_idx => $quiz_id ) {
			foreach ( $quizzes as $quiz_idx => $quiz_attempt ) {
				if ( $quiz_attempt['quiz'] == $quiz_id ) {
					$quiz_key                 = $quiz_attempt['time'] . '-' . $quiz_attempt['quiz'];
					$quizzes_tmp[ $quiz_key ] = $quiz_attempt;
					unset( $quizzes[ $quiz_idx ] );
				}
			}
		}
		$quizzes = $quizzes_tmp;
		krsort( $quizzes );
		if ( ! empty( $quizzes ) ) {
			foreach ( $quizzes as $quizdata ) {
				if ( ! in_array( $quizdata['quiz'], wp_list_pluck( $certificates, 'ID' ) ) ) {
					$quiz_settings         = learndash_get_setting( $quizdata['quiz'] );
					$certificate_post_id   = intval( $quiz_settings['certificate'] );
					$certificate_post_data = get_post( $certificate_post_id );
					$certificate_data      = learndash_certificate_details( $quizdata['quiz'], $user_id );
					if ( ! empty( $certificate_data['certificateLink'] ) && $certificate_data['certificate_threshold'] <= $quizdata['percentage'] / 100 ) {
						$filename              = sanitize_file_name( get_the_title( $quizdata['quiz'] ) ) . "-" . sanitize_file_name( get_the_title( $certificate_post_id ) ) . ".pdf";
						$certificate           = new \stdClass();
						$certificate->ID       = $quizdata['quiz'];
						$certificate->link     = $certificate_data['certificateLink'];
						$certificate->title    = get_the_title( $quizdata['quiz'] );
						$certificate->filename = $filename;
						$certificate->date     = date_i18n( "Y-m-d h:i:s", $quizdata['time'] );
						$certificate->time     = $quizdata['time'];
						$certificate->type     = 'quiz';
						$certificates[]        = $certificate;
					}
				}

			}
		}
	}

	usort( $certificates, function ( $a, $b ) {
		return strcmp( $b->time, $a->time );
	} );

	return $certificates;
}