WordPress: Custom post type

movies_post_type.php

<?php
/*
Plugin Name: Movies Post Type
Plugin URI: http://vienhoang.com
Description: Offers a method for managing a movie collection.
Version: 1.0
Author: Vien Hoang
Author URI: http://vienhoang.com
License: GPL2
*/

class VH_Movies_Post_Type {

	public function __construct() {
		$this->register_post_type();
		$this->taxonomies();
		$this->metaboxes();
	}

	public function register_post_type() {

		$args = array(
			'labels' => array(
				'name' => 'Movies',
				'singular_name' => 'Movie',
				'add_new' => 'Add New Movie',
				'add_new_item' => 'Add New Movie',
				'edit_item' => 'Edit Item',
				'new_item' => 'Add New Item',
				'view_item' => 'View Movie',
				'search_items' => 'Search Movies',
				'not_found' => 'No Movies Found',
				'not_found_in_trash' => 'No Movies Found in Trash'
			),
			// How we query 
			'query_var' => 'movies',
			'rewrite' => array(
				'slug' => 'movies'
			),
			// Visual in back end
			'public' => true,
			'menu_position' => 25,
			'menu_icon' => admin_url() . 'images/media-button-video.gif',
			'supports' => array(
				'title',
				'thumbnail',
				'excerpt'
			)
		);

		register_post_type( 'vh_movie', $args );
	}

	public function taxonomies() {

		$taxonomies = array();

		$taxonomies['genre'] = array(
			// Can have a parent
			'hierarchical' => true,
			'query_var' => 'movie_genre',
			'rewrite' => array(
				'slug' => 'movies/genre'
			), 
			'labels' => array(
				'name' => 'Genre',
				'singular_name' => 'Genre',
				'edit_item' => 'Edit Genre',
				'update_item' => 'Update Genre',
				'add_new_item' => 'Add Genre',
				'new_item_name' => 'Add New Genre',
				'all_items' => 'All Genres',
				'search_items' => 'Search Genres',
				'popular_items' => 'Popular Genres',
				'separate_items_with_comments' => 'Seperate genres with commas',
				'add_or_remove_items' => 'Add or remove genres',
				'choose_from_most_used' => 'Choose from the most used genres'
			)
		);		

		$taxonomies['studio'] = array(
			// Can have a parent
			'hierarchical' => true,
			'query_var' => 'movie_studio',
			'rewrite' => array(
				'slug' => 'movies/studios'
			), 
			'labels' => array(
				'name' => 'Studio',
				'singular_name' => 'Studio',
				'edit_item' => 'Edit Studio',
				'update_item' => 'Update Studio',
				'add_new_item' => 'Add Studio',
				'new_item_name' => 'Add New Studio',
				'all_items' => 'All Studios',
				'search_items' => 'Search Studios',
				'popular_items' => 'Popular Studios',
				'separate_items_with_comments' => 'Seperate studios with commas',
				'add_or_remove_items' => 'Add or remove studios',
				'choose_from_most_used' => 'Choose from the most used studios'
			)
		);

		$this->register_all_taxonomies( $taxonomies );
	}

	public function register_all_taxonomies( $taxonomies ) {
		// $name = genre, $arr = array
		foreach ($taxonomies as $name => $arr) {
			register_taxonomy( $name, array('vh_movie'), $arr );	
		}
	}

	public function metaboxes() {
		add_action( 'add_meta_boxes', function() {
			// css id, title, cb func, page, priority, cb func arguments
			add_meta_box( 'vh_movie_length', 'Movie length', 'movie_length', 'vh_movie' );
		} );

		function movie_length( $post ) {
			// Get the movie length stored in post meta, 3rd param true to return a single value
			$length = get_post_meta( $post->ID, 'vh_movie_length', true);

			?>

			<p>
				<label for="vh_movie_length">Length: </label> 
				<input type="text" class="widefat" name="vh_movie_length" id="vh_movie_length" value="<?php echo esc_attr( $length );?>" />
			</p>
			<?php
		}

		// Save the movie length
		add_action( 'save_post', function( $id ) {
			if ( isset($_POST['vh_movie_length']) ) {
				update_post_meta(
					$id,
					'vh_movie_length',
					strip_tags($_POST['vh_movie_length'])
				);
			}
		} );

	}
}

// Create a new instance of this class with WP init
add_action( 'init', function() {
	new VH_Movies_Post_Type();
	include dirname( __FILE__ ) . '/movies_post_type_shortcode.php';
});