PHP: WP: Custom Post Type Definition

PHP: WP: Register Custom Post Type

// Books Custom Post Type Definition

function books_cpt_init() {
  $labels = array(
		'name' => 'Books',
		'singular_name' => 'Book',
		'add_new' => 'Add New',
		'add_new_item' => 'Add New Book',
		'edit_item' => 'Edit Book',
		'new_item' => 'New Book',
		'all_items' => 'All Books',
		'view_item' => 'View Book',
		'search_items' => 'Search Books',
		'not_found' =>  'No books found',
		'not_found_in_trash' => 'No books found in Trash', 
		'parent_item_colon' => '',
		'menu_name' => 'Books'
	);

	$args = array(
		'labels' => $labels,
		'public' => true,
		'publicly_queryable' => true,
		'show_ui' => true, 
		'show_in_menu' => true, 
		'query_var' => true,
		'rewrite' => array( 'slug' => 'book' ),
		'capability_type' => 'post',
		'has_archive' => true, 
		'hierarchical' => false,
		'menu_position' => null,
		'supports' => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'comments' )
	); 

	register_post_type( 'book', $args );
}

add_action( 'init', 'books_cpt_init' );