learndash_post_args

 <?php
/**
 * Example usage for learndash_post_args filter.
 */
add_filter(
	'learndash_post_args',
	function( $post_args = array() ) {
		if ( ( ! isset( $post_args['sfwd-certificates']['cpt_options']['supports'] ) ) || ( ! is_array( $post_args['sfwd-certificates']['cpt_options']['supports'] ) ) ) {
			$post_args['sfwd-certificates']['cpt_options']['supports'] = array();
		}

		$post_args['sfwd-certificates']['cpt_options']['supports'] = array_merge( $post_args['sfwd-certificates']['cpt_options']['supports'], array( 'custom-fields' ) );

		// always return the $post_args array
		return $post_args;
	},
	10,
	1
);

add_filter(
	'learndash_post_args',
	function( $post_args = array() ) {

		$post_args['sfwd-courses']['cpt_options']['show_in_nav_menus']  = true;
		$post_args['sfwd-lessons']['cpt_options']['show_in_nav_menus']  = true;
		$post_args['sfwd-topic']['cpt_options']['show_in_nav_menus']    = true;
		$post_args['sfwd-quiz']['cpt_options']['show_in_nav_menus']     = true;
		$post_args['sfwd-question']['cpt_options']['show_in_nav_menus'] = true;

		// always return the $post_args array
		return $post_args;
	},
	10,
	1
);

// Add Custom Field Support to LD Course post type sfwd-courses.
add_filter(
	'learndash_post_args',
	function( $post_args = array() ) {
		// Other LearnDash post types
		// Lessons - sfwd-lessons
		// Topics - sfwd-topic
		// Quizzes - sfwd-quiz

		if ( isset( $post_args['sfwd-courses']['cpt_options']['supports'] ) ) {

			if ( ! is_array( $post_args['sfwd-courses']['cpt_options']['supports'] ) ) {
				$post_args['sfwd-courses']['cpt_options']['supports'] = array( 'custom-fields' );
			} elseif ( ! in_array( 'custom-fields', $post_args['sfwd-courses']['cpt_options']['supports'] ) ) {
				$post_args['sfwd-courses']['cpt_options']['supports'][] = 'custom-fields';
			}
		} else {
				$post_args['sfwd-courses']['cpt_options']['supports'] = array( 'custom-fields' );
		}

		// always return the $post_args array
		return $post_args;
	},
	10,
	1
);

add_filter(
	'learndash_post_args',
	function( $post_args = array() ) {
		// LearnDash v2.5.3 LEARNDASH-1388
		if ( LearnDash_Settings_Section::get_section_setting( 'LearnDash_Settings_Courses_Builder', 'shared_steps' ) != 'yes' ) {
			$post_args['sfwd-lessons']['cpt_options']['show_in_nav_menus'] = true;
			$post_args['sfwd-topic']['cpt_options']['show_in_nav_menus']   = true;
			$post_args['sfwd-quiz']['cpt_options']['show_in_nav_menus']    = true;
		}

		// always return the $post_args array
		return $post_args;
	},
	10,
	1
);

add_filter(
	'learndash_post_args',
	function( $post_args = array() ) {

		// Example 1
		// As of LD v2.3 this all custom post types were excluded from search
		// We want to include Courses and Lesson in the WP search results.
		if ( isset( $post_args['sfwd-courses']['cpt_options']['exclude_from_search'] ) ) {
			$post_args['sfwd-courses']['cpt_options']['exclude_from_search'] = false;
		}

		if ( isset( $post_args['sfwd-lessons']['cpt_options']['exclude_from_search'] ) ) {
			$post_args['sfwd-lessons']['cpt_options']['exclude_from_search'] = false;
		}

		// always return the $post_args array
		return $post_args;
	},
	10,
	1
);

add_filter(
	'learndash_post_args',
	function( $post_args = array() ) {

		if ( isset( $post_args['sfwd-certificates']['slug_name'] ) ) {
			$post_args['sfwd-certificates']['slug_name'] = 'ld-certificates';
		}

		// always return the $post_args array
		return $post_args;
	},
	10,
	1
);