I gave a brief overview of the new Custom Post Types in WordPress 3. I talked about how we can use them and did a demo of creating our 1st Custom Pots Type plugin. The plugin can be downloaded from http://www.tripleginteractive.com/blog/wordpress/wordcamp-columbus-custom-post-types/

1. Custom Post Types & Taxonomies
Gregg Henry
triple G interactive
@GreggHenry

2. Hello.
· BS in Computer Science from Bowling Green State University.
· 10 Years of Web Development Experience.
· 5 Years of Coding WordPress Themes and Plugins.
· 3 Years of running triple G interactive.

3. So...What is a Custom Post Type?
· The same way you can create regular posts, you can create custom ones with more
creative control.
· Not just a custom post, but custom content.
· Been around since WP2.9.
Examples
· Portfolio, Video Library, Testimonials, FAQs, Recipes, etc.
Advantanges
· Easier on developers; no more relying on custom fields.
· Easier for your clients to use; have their own navigation link.
Take Note
· Don’t get carried away with custom post types!

4. Wait...What is a Taxonomy?
· Put in very easy to understand words - its just a way to classify and group things.
· Built in taxonomies are Categories and Tags
· Been around since WP 2.3, but now extremely handy with Custom Post Types
Custom Taxonomies Example
· genres for books

5. Our 1st Plugin with Custom Post Types
· Create a Recipe Class to house our plugin
· Register the post type ‘recipe’
· Add Custom Meta Box (no more ugly custom fields)
· Create custom categories using taxonomies
· Tips on how to display the new content we have
· Profit?

6. Step 1: Let’s Get Started
· Create your folder recipress in wp-content/plugins/
· Create recipress.php in wp-content/plugins/recipress/
<?php
/*
Plugin Name: ReciPress
Plugin URI: http://www.tripleginteractive.com/
Description: Add a basic Recipe Plugin for your website using custom post types.
Author: Gregg Henry
Version: 1.0
Author URI: http://www.tripleginteractive.com/
*/

7. Step 2: Create The Class to house our Plugin
· define any constant variables
· give the class a unique name
define(RECIPRESS_POST_TYPE, ‘recipe’);
class Recipress
{
}

8. Step 3: Tap into Plugin Activation Hook
· register_activation_hook function lets us run specific code when the plugin is activat-
ed.
· We need to flush the rewrite rules
define(RECIPRESS_POST_TYPE, ‘recipe’);
class Recipress
{
function Install() {
flush_rewrite_rules();
}
} //end Recipress Class
register_activation_hook(__FILE__, array(‘Recipress’,’Install’));

9. Step 4: Initialize and Register the post type ‘recipe’
· Add an Initialize function to your class.
· Register the post type in this function.
function Initialize()
{
...
register_post_type(RECIPRESS_POST_TYPE,$args);
...
}
· Outside of our class we will call Initialize to hook into ‘init’
add_action(‘init’, array(‘Recipress’, ‘Initialize’));

11. Register the Taxonomy (Category)
· We can use the built-in taxonomy for categories, but we wont.
· We’ll create a custom taxonomy so that it’s specific to Recipes.
· Add the below code to the end of the Initialize function.
register_taxonomy(
‘cat’,
array(RECIPRESS_POST_TYPE),
array(‘hierarchical’ => true,
‘show_ui’ => true,
‘query_var’ => true,
‘rewrite’ => array( ‘slug’ => ‘category’ ),
));

13. Step 5: Showing Categories in column layout
· Adding a new column to your custom posts list in the Admin.
function edit_column_title($defaults) {
$defaults[‘cat’] = ‘Category’;
return $defaults;
}
function edit_column_value($column_name, $post_id) {
$taxonomy = $column_name;
...
echo join( ‘, ‘, $post_terms );
}
· Outside of our class we will call a filter and action to add info.
add_filter( ‘manage_recipe_posts_columns’, array(‘Recipress’,’edit_column_title’) );
add_action(‘manage_recipe_posts_custom_column’, array(‘Recipress’,’edit_column_value’), 10, 2);

15. Step 6: Add a Custom Meta Box
· A custom post type needs a custom meta box :-)
· Utilize any type of form element· We’ll setup a textbox for
Calorie Count in the sidebar.
function meta_options(){
global $post;
$custom = get_post_custom($post->ID);
$calories = $custom[“calories”][0];
?>
<label>Calories:</label><input name=”calories” value=”<?php echo
$calories; ?>” />
<?php
}

17. Front End Display
· Now that we have the admin created, how do we display what we created?
Displaying a Single Custom Post
· Create single-recipe.php to make a single post page.
Looping Through your Custom Posts
· Place this snippet of code right before the loop.
<?php query_posts( ‘post_type=recipe’); ?>
Display custom meta box content
· Do it the same way in the meta_options function.
$custom = get_post_custom($post->ID);
$calories = $custom[“calories”][0];
echo $calories;

18. Recap
· Custom Post Types are new for WP3.
· Creative control over custom content.
· Easier on developers; no more relying on custom fields.
· Easier for your clients to use; have their own navigation link.
· Great for things that can be cataloged, but not for categorizing
· We walked through creating a plugin that allows a user to enter Recipes
· We registered our post type of ‘recipe’
· We registered our taxonomy ‘cat’
· We added a custom meta box
· Then we displayed the content for the user.

19. Resources
· http://codex.wordpress.org/Function_Reference/register_post_type
· http://codex.wordpress.org/Taxonomies
· http://thinkvitamin.com/code/create-your-first-wordpress-custom-post-type/

20. Thank You.
· Questions?