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Getting Started With WordPress Development

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A presentation from Iowa Code Camp 2010 by Kenny Younger (@kenny) and Andy Brudtkuhl (@abrudtkuhl)

A presentation from Iowa Code Camp 2010 by Kenny Younger (@kenny) and Andy Brudtkuhl (@abrudtkuhl)

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  • Describe each table.
  • Transcript

    • 1. Intro To WordPress Development
      Kenny Younger (@kenny)
      &
      Andy Brudtkuhl (@abrudtkuhl)
    • 2. What does WordPress look like to the users?
      Let’s take a look!
    • 3. Database
    • 4. Database Schema
      Source: SchemaBank.com
    • 5. File Structure
    • 6. /
      wp-admin/
      wp-content/
      plugins/
      Each plugin usually has its own directory
      themes/
      Each theme has its own directory
      uploads/
      Created on first upload (default location)
      wp-includes/
      wp-config.php
    • 7. wp-config.php
      define('WP_ALLOW_MULTISITE', true);
    • 8. Debugging made easy
      Debugging flags added to wp-config.php:
      define( 'WP_DEBUG', true );
      define( 'SCRIPT_DEBUG', true );
      define( 'SAVEQUERIES', true );
      $wpdb->queries
      “All” hook:
      add_action( 'all', create_function( '', 'var_dump( current_filter() );' ) );
      Core Control Plugin:
      http://wordpress.org/extend/plugins/core-control/
      Dump Environment Plugin:
      http://wordpress.org/extend/plugins/dump_env/
      Source: http://www.andrewnacin.com/2010/04/23/5-ways-to-debug-wordpress/
    • 9. WordPress Themes
      What are themes? A way to skin WordPress
    • 10. What’s In A WordPress Theme?
      WordPress themes are a combination of PHP, CSS, and image files
      Requirements:
      HTML
      CSS
      Some PHP
    • 11. Anatomy Of A WordPress Theme
    • 12. Theme Structure
      Index.php
      includes header.php
      Includes sidebar.php
      Includes footer.php
    • 13. Standard Theme Architecture
      Homepage
      index.php
      home.php
      Single Post
      single.php
      Page
      page.php
      Category
      category.php
      archive.php
    • 19. The Stylesheet – style.css
      The comment headers in the style.css provide meta info to WP are are REQUIRED
      Thisstylesheet also controls the layout and design elements of your theme…
    • 20. Functions.php
      Contains theme related functions and commonly is used to generate dynamic sidebars
    • 21. The Loop
      If (havePosts)
      show post stuff
      Else
      nothing here!
      End if
    • 22. Template Tags
    • Theme Frameworks
    • 27. What Is A WordPress Plugin?
      Plugins are used to add or enhance functionalities of your WordPress site
    • 28. The Plugin Directory
      http://wordpress.org/extend/plugins/
    • 29. The Plugin API
      The API provides “Hooks” into WordPress
      No more hacking the core
      Made up of Actions and Filters
      Actions = functions triggered by events
      ie: Call function on user log in
      Filters = functions that modify information
      ie: Add facebook share button before post
    • 30. Plugin Data
      Sometimes it’s necessary to store data…
      For large amounts, create a new database table
      For small amounts, use WordPress “Options” – a table with key/value pairs
    • 31. Admin Menus
      Custom option panels for users to update settings for your plugin
      Adds options in WordPress Admin Dashboard
    • 32. Users & Roles & Capabilities
      WordPress is designed to handle multiple users – from admin and editors to subscribers
      5 Pre-Defined Roles
      Administrator
      Editor
      Author
      Contributor
      Subscriber
      http://codex.wordpress.org/Roles_and_Capabilities
    • 33. Custom Fields
      Allow attaching meta-data to posts.
      http://www.smashingmagazine.com/2010/04/29/extend-wordpress-with-custom-fields/
    • 34. Custom Post Types
      Used for:
      Real Estate Listing
      Event Calendar
      Movie Database
      Issue Management / Ticket System
      Etc.
    • 35. Custom Post Type Options
      label
      singular_label
      description
      public – query-able from public?
      menu_position
      menu_icon
      hierarchical
      query_var
      capability_type – permissions
      supports
      rewrite
      taxonomies
      register_meta_box_cb
      permalink_epmask
    • 36. Custom Post Types – Integration with the loop
      <?php $loop = new WP_Query( array( 'post_type' => my_custom_post_type', 'posts_per_page' => 10 ) ); ?>
      <?php while ( $loop->have_posts() ) : $loop->the_post(); ?>
      <?phpthe_title( '<h2 class="entry-title"><a href="' . get_permalink() . '" title="' . the_title_attribute( 'echo=0' ) . '" rel="bookmark">', '</a></h2>' );
      ?>
      <div class="entry-content">
      <?phpthe_content(); ?>
      </div>
      <?phpendwhile; ?>
    • 37. Taxonomies
      What are taxonomies?
      register_taxonomy()
      Shows up in menu system
      Demo
      register_taxonomy(
      'actor',
      'post',
      array(
      'hierarchical' => false,
      'label' => __('Actors', 'series'),
      'query_var' => 'actor',
      'rewrite' => array( 'slug' => 'actors' )
      )
      );
    • 38. Core Development
      Versioning
      0.1 increments
      Based on time, not features
      Generally every 5-6 months
      0.0.1 – usually security fixes, other small bug fixes
      Always update!!
      Mailing lists:
      http://codex.wordpress.org/Mailing_Lists
      Trac:
      http://core.trac.wordpress.org
    • 39. Resources
      Planet - planet.wordpress.org
      WordPress Codex – codex.wordpress.org
      WordPress Forums – wordpress.org/support
      All Things WordPress- wordpress.alltop.com
      Core Development Blog – devel.wordpress.org
    • 40. August 7th, Downtown Des Moines Public Library
    • 41. Thanks!!!
      Kenny Younger (@kenny)
      &
      Andy Brudtkuhl (@abrudtkuhl)