WordPress: Redirect single custom post type to archive page.

functions.php

// redirect single posts to the archive page, scrolled to the current member.
// * this is for a post type of "board_member"
add_action( 'template_redirect', function() {
    if ( is_singular('board_member') ) {
    // I used the two variables to put the member's name as the ID of the article
    // so the redirect would automatically scroll. This can be removed.
		$title = get_the_title();
		$url_append = str_replace( ' ', '-', strtolower($title) );
        global $post;
        $redirectLink = get_post_type_archive_link( 'board_member' ) . "#" . $url_append;
        wp_redirect( $redirectLink, 302 );
        exit;
    }
});

You could use the built in sanitize_title in line 8.

Use $url_append = sanitize_title($title); instead of $url_append = str_replace( ' ', '-', strtolower($title) );