WP: Custom Taxonomies And Post Types

custom_taxes_and_posts.php

<?php //http://codex.wordpress.org/Function_Reference/register_post_type#Example
/**
 * Base-settings for adding additional features to an existing WP install
 * 
 * Location: functions.php file
 *
 * 
 * 
 * It's best to play around with the setting below, but this
 * basic structure allows for:
 * 
 * 		1. custom post types (Pages & Posts)
 * 		2. custom taxonomies (Tags & Categories)
 *		3. adding custom taxonomies to existing post types
 * 		4. adding featured-images to posts
 * 		5. fixing the permalinks for custom post types/taxonomies
 */

/*********************************************************
	CUSTOM FUNCTIONS
**********************************************************/

	// enable 'feature-image' thumbnails on posts
	if ( function_exists( 'add_theme_support' ) ) { 
	  add_theme_support( 'post-thumbnails' ); 
	}



	/**
	 * Custom Post Types
	 *
	 * Add additional Post & Page types
	 * 
	 * @author Adam Brewer
	 */
	add_action( 'init', 'my_custom_post_types' );
	function my_custom_post_types() {
		register_post_type( 'games',
			array(
				'labels' => array(
					'name' => __( 'Games' ),
					'singular_name' => __( 'Game' ),
		            'add_new' => 'Add New Game',
		            'edit_item' => 'Edit Game',
		            'new_item' => 'New Game',
		            'view_item' => 'View Games',
		            'search_items' => 'Search Games',
		            'not_found' => 'No Games found',
		            'not_found_in_trash' => 'No Games found in Trash'
				),
				'public' => true,
				'has_archive' => true,
				'rewrite' => array('slug' => 'games'),
				'supports' => array( 'title','editor', 'thumbnail', 'excerpt', 'custom-fields' ),
				'taxonomies' => array('skill') // hard-set the allowed taxonomies, built in (tags, categories) or custom ones (skills)
			)
		);
	}



	/**
	 * Custom Taxonomies
	 *
	 * Add additional Categories & Post Tags types
	 * 
	 * @author Adam Brewer
	 */
	add_action( 'init', 'create_custom_taxonomies', 0 );
	function create_custom_taxonomies() {	  
		// New taxonomy: Skills [non hierarchical]
		$labels = array(
			'name' => _x( 'Skills', 'taxonomy general name' ),
			'singular_name' => _x( 'Skill', 'taxonomy singular name' ),
			'search_items' =>  __( 'Search Skills' ),
			'all_items' => __( 'All Skills' ),
			'parent_item' => NULL,
			'parent_item_colon' => NULL,
			'edit_item' => __( 'Edit Skill' ), 
			'update_item' => __( 'Update Skill' ),
			'add_new_item' => __( 'Add New Skill' ),
			'new_item_name' => __( 'New Skill Name' ),
			'menu_name' => __( 'Skills' ),
		); 	
		register_taxonomy('skill', array('game'), array(
		'hierarchical' => true,
		'labels' => $labels,
		'show_ui' => true,
		'query_var' => true,
		'rewrite' => array( 'slug' => 'skill' ),
		));

	}


	/**
	 * Register Custom Taxonomies to existing Post & Page types
	 *
	 * Only for custom tags & cats to existing Post & Page post types
	 * 
	 * @author Adam Brewer
	 */
	// add_action('init', 'my_add_tags_and_cats');
	function my_add_tags_and_cats() {
		register_taxonomy_for_object_type('skill', 'games');
	}

	/**
	 * Helper to fix the permalink re-writes issue with custom post types
	 *	  
	 * @author http://xplus3.net/2010/05/20/wp3-custom-post-type-permalinks/
	 */
	function my_post_type_link_filter_function( $post_link, $id = 0, $leavename = FALSE ) {
		if ( strpos('%issue_project%', $post_link) === FALSE ) {
			return $post_link;
		}
		$post = get_post($id);
		if ( !is_object($post) || $post->post_type != 'issue' ) {
			return $post_link;
		}
		$terms = wp_get_object_terms($post->ID, 'issue_project');
		if ( !$terms ) {
			return str_replace('project/%issue_project%/', '', $post_link);
		}
		return str_replace('%issue_project%', $terms[0]->slug, $post_link);
	}
  	add_filter('post_type_link', 'my_post_type_link_filter_function', 1, 3);