WordPress is a free and open-source content management system that can be used to create blogs and websites. It has a plugin architecture and a template system that allows for great flexibility and customization. WordPress is highly extensible through plugins and has a large community that contributes plugins, themes, and translations to support users in many different languages.

1. From
with love
by Peter K.

2. Back in year 2003
b2/cafelog
2000 blogs
Release Archive
> http://wordpress.org/download/release-archive/
Jazzers and Release Dates
> http://wordpress.org/about/roadmap/

3. Philosophy
• Out of the Box - little configuration and setup; Famous 5-
minute install is more like 1-minute install.
• Design for the Majority - The average user wants to be
able to write without problems or interruption.
• Decisions not Options - Users are considered being first.
Avoid putting the weight of technical choices on end users.
• Clean, Lean, and Mean - It's designed to be lean and fast.
The rule of thumb - core should provide features that 80% or
more of end users will appreciate and use.
• Striving for Simplicity - Make it easier to use with
every single release. Simplicity is always an open task.

4. Current Stats
100,000+
per day
(2011)
100+
per min.
http://wordpress.com/stats/
http://wordpress.org/download/counter/

5. Notable WordPress Users
http://wordpress.org/showcase/

6. 20 million monthly unique visitors
http://mashable.com/

7. .COM versus .ORG
… is a free and open source web software
… is a service … is a community
• Ready-to-use, free registration • Do-it-yourself, free download
• Maintenance, backups and high traffic • Maintenance, backups, high traffic and
are covered by the team security issues are up to you
• Security - SSL Dashboard • Free Themes (1,600+) and Plugins
• Paid services – domain mapping, space (21,000+) http://wordpress.org/extend/
upgrades, custom design, no ads, etc. • Full control, code modifications, etc.
• Limitations - themes (225), plugins, code • Get Involved - http://make.wordpress.org
• VIP program - http://vip.wordpress.com • Develop - http://core.trac.wordpress.org

8. Mobile Apps
Available for: iOS, Android, BlackBerry, Windows Phone 7, Nokia, WebOS
http://wordpress.org/extend/mobile/

9. In Your Language
WordPress community has already
translated WordPress into more than
70 languages…
http://bg.wordpress.org/ - Bulgarian
http://nl.wordpress.org/ - Dutch
and so on…
Easy switching from one
language to another.

10. Take part
http://translate.wordpress.org

11. NOW()
Highlights in WordPress 3.4
• Enhanced theme control
• Customize theme options before activating a new theme using Theme
Customizer
• Use Theme Previewer to customize current theme without changing the
front-end design
• Custom Headers
• Improved Custom Headers with flexible sizes
• Selecting Custom Header Images and Custom Background Images
from Media Library Screen
• Media improvements
• Support HTML in image captions
• Add Twitter.com as an oEmbed providers
• Under the Hood improvements
• Improvements in WordPress internationalization and localization
• Different split in translation POT files for faster translations
• Codex XML-RPC information update accessed via XML-RPC_WordPress_API
• WP_Query improvements

12. In Pictures

13. Coming Soon
WordPress 3.5 is the next major release, planned for 5th December 2012.
Major versions are coming out bi-annually.
WordPress 3.5 Beta 1 is already downloadable for testing purposes.
http://wordpress.org/wordpress-3.5-beta-1.zip
Highlights:
• Administration - Polished all-HiDPI (retina) dashboard
• Media - complete overhaul. Uploading photos, arranging
galleries, inserting images into posts, and more.
• Improved keyboard navigation and screen reader support.
• Link Manager - hidden on new installs, activation available via
plugin http://wordpress.org/extend/plugins/link-manager/
• A new color picker and simplified welcome screen
• Updated libraries - TinyMCE, SimplePie, jQuery, jQueryUI
• Browse and install plugins marked as favorites on WordPress.org
• New oEmbed providers - Soundcloud, Slideshare. Added support
for SSL links.

14. Raw preview

15. New Default Theme
Twenty Twelve is ready for use. Comes with WordPress 3.5
http://wordpress.org/extend/themes/twentytwelve
• Uses the latest Theme Features
• And, yes, a fully responsive design
• Good baseline for making Child Themes

16. <?php echo ‘Under the hood’; ?>
• Core
• Themes and Child Themes
• Template Hierarchy and Custom Templates
• Plugins - functions.php, self-made plugins
• Functions, Classes, APIs
• Hooks - Actions and Filters

17. Core
Want to hack/modify the WordPress core?
Don’t!
Because:
1. You create zero-day vulnerabilities
2. You’re hacking up what plugins were made to do
3. Your site is no longer future-proof
”
It is basically never really necessary. If you examine like half the core
code, you’ll find that WordPress itself uses its own action and filter
hooks extensively. In a sense, quite a lot of the WordPress core code is a
plugin. --- Otto

18. Themes
The minimum set of files that a WordPress theme needs is:
• style.css
• index.php
Stylesheet header is needed, in order theme to be
discovered by WordPress:
/*
Theme Name: Twenty Ten
Theme URI: http://wordpress.org/
Description: The 2010 default theme for WordPress.
Author: wordpressdotorg
Author URI: http://wordpress.org/
Version: 1.0
Tags: black, blue, white, two-columns, fixed-width, custom-header, custom-
background, threaded-comments, sticky-post, translation-
ready, microformats, rtl-language-support, editor-style, custom-menu
(optional)
License:
License URI:
General comments (optional).
*/

19. Child Themes
… inherits the functionality of another theme, called the
parent theme.
… are the recommended way of making modifications to
a theme.
Stylesheet header is needed, in order theme to be
discovered by WordPress:
/*
Theme Name: Twenty Eleven Child
Theme URI: http://example.com/
Description: Child theme for Twenty Eleven theme.
Author: Your name
Author URI: http://example.com/
Template: twentyeleven
Version: 0.1.0
*/
@import url("../twentyeleven/style.css");
#site-title a { color: #090; }

20. functions.php
• resides in the theme directory
• basically acts like a plugin
• is automatically loaded during WordPress initialization
(both for admin pages and external pages)
• is suggested for managing theme features, defining
custom functions, setting up theme options, etc.
• If the logic has to be available for all themes, put it in a
plugin instead…
• In a child theme, functions.php is loaded prior to parent
themes’ functions.php - a trouble-free method of
modifying the functionality of a parent theme.
• User functions of a parent theme should be pluggable -
declared conditionally.

21. Template Hierarchy

22. Plugins
…allow easy modification, customization, and enhancement
to a WordPress website.
Many WordPress Plugins accomplish their goals by connecting to one or more WordPress
Plugin "hooks". The way Plugin hooks work is that at various times while WordPress is
running, WordPress checks to see if any Plugins have registered functions to run at that
time, and if so, the functions are run. These functions modify the default behavior of
WordPress.
Plugin header is needed, in order plugin to be discovered
by WordPress:
<?php
/*
Plugin Name: Name Of The Plugin
Plugin URI: http://URI_Of_Page_Describing_Plugin_and_Updates
Description: A brief description of the Plugin.
Version: The Plugin's Version Number, e.g.: 1.0
Author: Name Of The Plugin Author
Author URI: http://URI_Of_The_Plugin_Author
License: A "Slug" license name e.g. GPL2
*/
?>

23. Hooks
…allow your plugin to 'hook into' the rest of WordPress.
1. Actions - hooks that the WordPress core launches at
specific points during execution, or when specific events
occur. Your plugin can specify that one or more of its
PHP functions are executed at these points, using the
Action API. (near 600 in WP 3.4)
2. Filters - hooks that WordPress launches to modify text of
various types before adding it to the database or
sending it to the browser screen. Your plugin can specify
that one or more of its PHP functions is executed to
modify specific types of text at these times, using the
Filter API. (more than 1000 in WP 3.4)

24. Sidebars and Widgets
• Registered sidebars are dynamic and act
like containers for a set of widgets.
• Sidebars can have default content.
• A theme can have many registered
sidebars, placed in a different templates.
• Sidebars can have own templates.
• Widgets can have multiple instances
• Widgets can have various options to
display specific content on the front page.

25. Examples
• BuddyPress
• bbPress
• WPML, WordPress Language
• W3 Total Cache
• WordPress SEO
• WooCommerce
• Posts 2 Posts
• Front End Editor
• Custom Post Type UI

26. BuddyPress
Start your own self-hosted and WordPress-based social network!
Key features:
• Activity streams
• User groups
• Multisite blogging
• Friend connections
• User profiles
• Discussion boards
• Private messages
• more on http://buddypress.org

27. bbPress
A lightweight forum software focused on ease of integration and
use, web standards, and speed.
Key features:
• Fully integrated
• Simple interface
• Customizable
• Highly extensible
• and more…
• http://bbpress.org

28. WPML
The WordPress Multilingual Plugin
Key features:
• Premium plugin (annual)
• Multiple languages (40+)
• Translation management
• Text translations
• Professional translations
• Uses native WP functionality
• Plugins that extend the core
• Reliable support
• more on http://wpml.org

29. W3 Total Cache
Web Performance Optimization for WordPress
Key features:
• Compatibility – shared
hosting, VPS, dedicated server
• CDN integration
• Mobile support
• Minification
• Caching of
browser, page, object, databa
se
• Trusted by the big guys
http://wordpress.org/extend/plugins/w3-total-cache/

30. WordPress SEO
Fully optimize your site using the WordPress SEO
Key features:
• Page Analysis
• Technical Optimization
• Meta & Link Elements
• XML Sitemaps
• RSS Optimization
• Breadcrumbs
• Social Integration
• Import & Export
• http://yoast.com/wordpress/seo/

31. WooCommerce
Powerful and extendable eCommerce plugin that helps you sell
anything. Beautifully.
Key features:
• Products & Inventory
• Customers & Orders
• Marketing & Promotion
• Shipping & Tax
• Payment Gateways
• Reporting
• Themes & Templates
• Premium Extensions
• etc.
http://www.woothemes.com/woocommerce/

32. Posts 2 Posts
Efficient many-to-many connections between
posts, pages, custom post types, users.
http://scribu.net/wordpress/posts-to-posts

33. Front-end Editor
Edit content inline, without going to the admin area.
http://scribu.net/wordpress/front-end-editor

34. Custom Post Type UI
Admin UI for creating custom post types and custom taxonomies.
http://wordpress.org/extend/plugins/custom-post-type-ui/

35. Many WordPress sites?
You can manage them from a central admin panel.
http://infinitewp.com/

36. ?