Yoast breadcrumbs for LearnDash

yoast_breadcrumbs_learndash.php

<?php 
function stomp_filter_learndash_yoast_breadcrumbs( $links ) {

	$course_label = 'Courses';
	$labels = get_option( 'learndash_custom_label_settings' );
	if ( ! empty( $labels['courses'] ) ) {
		$course_label = sanitize_text_field( $labels['courses'] );
	}

	if ( is_singular( 'sfwd-lessons' )  ) {

		$breadcrumb[] = array(
			'url' => get_post_type_archive_link( 'sfwd-courses' ),
			'text' => $course_label,
		);

		$course_id = learndash_get_course_id();

		$breadcrumb[] = array(
			'url' => get_permalink( $course_id ),
			'text' => get_the_title( $course_id ),
		);

		array_splice( $links, 1, 0, $breadcrumb );

	}

	if ( is_singular( 'sfwd-quiz' ) || is_singular( 'sfwd-topic' ) ) {

		$breadcrumb[] = array(
			'url' => get_post_type_archive_link( 'sfwd-courses' ),
			'text' => 'Courses',
		);

		$course_id = learndash_get_course_id();

		$breadcrumb[] = array(
			'url' => get_permalink( $course_id ),
			'text' => get_the_title( $course_id ),
		);

	 	$lesson_id = learndash_get_lesson_id();

	 	$breadcrumb[] = array(
			'url' => get_permalink( $lesson_id ),
			'text' => get_the_title( $lesson_id ),
		);

	 	if ( is_singular( 'sfwd-quiz' ) ) {
	 		array_splice( $links, 1, 1, $breadcrumb );
	 	} else {
	 		array_splice( $links, 1, 0, $breadcrumb );
	 	}

	}

	return $links;

}
add_filter( 'wpseo_breadcrumb_links', 'stomp_filter_learndash_yoast_breadcrumbs' );