Custom Post Type with Category in Permalink

CMS & WordPress
1

I’m trying to get my taxonomy to show up in my permalink but it keeps leading to 404. If there’s one think I hate about Wordpress, it’s wrestling with the permalink structure and rewrites :confused:

The code works fine without the rewrite.

function arttax_permalink($permalink, $post_id, $leavename) {
    if (strpos($permalink, '%artcat%') === FALSE) return $permalink;

        // Get post
        $post = get_post($post_id);
        if (!$post) return $permalink;
		
        // Get taxonomy terms
        $terms = wp_get_object_terms($post->ID, 'arttax');
        if (!is_wp_error($terms) && !empty($terms) && is_object($terms[0])) $taxonomy_slug = $terms[0]->slug;
        else $taxonomy_slug = 'uncategorized';

    return str_replace('%artcat%', $taxonomy_slug, $permalink);
}
add_filter('post_link', 'arttax_permalink', 10, 3);
add_filter('post_type_link', 'arttax_permalink', 10, 3);

/** Create Post Type **/
function CPT_init(){
	// Articles CPT
	register_post_type('articles', array(
		'labels' 			=> 	array(
			'name'			=>		__('Articles'),
			'singular_name'	=>		__('Article'),
			'all_items'		=>		__('View Articles'),
			'add_new'		=>		__('New Article'),
			'add_new_item'	=>		__('New Article'),
			'edit_item'		=>		__('Edit Article'),
			'view_item'		=>		__('View Article'),
			'search_items'	=>		__('Search Articles'),
			'no_found'		=>		__('No Articles Found'),
			'not_found_in_trash' =>	__('No Articles in Trash')
								),
		'public'			=> 	true,
		'publicly_queryable'=> 	true,
		'show_ui' 			=> 	true,
		'query_var' 		=> 	true,
		'show_in_nav_menus'	=>	false,
		'capability_type' 	=> 	'page',
		'hierarchical' 		=> 	false,
		'rewrite'			=>	array('slug' => 'articles/%artcat%', 'with_front' => false),
		'menu_position' 	=> 	5,
		'supports' 			=> 	array('title','editor')
	));
}
add_action('init', 'CPT_init');

/** Add Custom Taxonomy **/
function cat_tax_init() {
	$labels = array(
		'name'              => __( 'Article Categories' ),
		'singular_name'     => __( 'Article Category' ),
		'search_items'      => __( 'Search Article Categories' ),
		'all_items'         => __( 'All Article Categories' ),
		'parent_item'       => __( 'Parent Article Category' ),
		'parent_item_colon' => __( 'Parent Article Category:' ),
		'edit_item'         => __( 'Edit Article Category' ),
		'update_item'       => __( 'Update Article Category' ),
		'add_new_item'      => __( 'Add New Article Category' ),
		'new_item_name'     => __( 'New Article Category' ),
		'menu_name'         => __( 'Article Categories' ),
	);
	$args = array(
		'labels' 			=> $labels,
		'public'			=>	true,
		'hierarchical'      =>  true,
		'show_in_nav_menus'	=>	true,
		'has_archive'		=>	true,
		'rewrite' 			=> 	array('slug' => '/category', 'with_front' => false)
	);
	register_taxonomy( 'arttax', 'articles', $args );
}
add_action( 'init', 'cat_tax_init');
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