WordPress 3 Plugin Development Essentials -- Table of Contents -- WordPress 3 Plugin Development Essentials -- Credits -- About the Authors -- About the Reviewers -- www.PacktPub.com -- Support files, eBooks, discount offers and more -- Why Subscribe? -- Free Access for Packt account holders -- Preface -- What this book covers -- What you need for this book -- Who this book is for -- Conventions -- Reader feedback -- Customer support -- Downloading the example code for this book -- Errata -- Piracy -- Questions -- 1. Preparing for WordPress Development -- WordPress background -- Extending WordPress -- Understanding WordPress architecture -- Templating -- Introducing plugins -- Summarizing architecture -- Tools for web development -- WordPress -- Mac -- Windows -- Text editor -- Using an IDE -- FTP client -- MySQL client -- Coding best practices -- Basic organization -- Isolate tasks into functions -- Use classes -- Use descriptive variable names -- Use descriptive function names -- Separate logic and display layers -- Go modular, to a point -- Avoid short tags -- Planning ahead / starting development -- Interfaces -- Localization -- Documentation for the developer -- Version control -- Environment -- Tests -- Security -- Printing user-supplied data to a page -- Using user-supplied data to construct database queries -- Debugging -- Clearing your browser cache -- Updating your php.ini file -- Configuring your wp-config.php file -- Checking your syntax -- Checking values -- Exercise -- Summary -- 2. Anatomy of a Plugin -- Deconstructing an existing plugin: "Hello Dolly" -- Activating the plugin -- Examining the hello.php file -- Information header -- Exercise-breaking the header -- Location, name, and format -- Understanding the Includes -- Exercise - parse errors -- Bonus for the curious -- User-defined functions.

Exercise-an evil functionless plugin -- What just happened -- Omitting the closing "?>" PHP tag -- A better example: Adding functions -- Referencing hooks via add_action() and add_filter() -- Actions versus Filters -- Exercise-actions and filters -- Exercise-filters -- Reading more -- Summary -- 3. Social Bookmarking -- The overall plan -- Proof of concept -- Avoiding conflicting function names -- The master plugin outline -- The plugin information header -- In your browser-information header -- Adding a link to the post content -- Documenting our functions -- In your browser-linking to the post content -- Adding JavaScript to the head -- Making our link dynamic -- In your browser-dynamic links -- Adding a button template -- Getting the post URL -- In your browser-getting the post URL -- Getting the post title -- Getting the description -- Getting the media type -- Getting the post topic -- In your browser-title, description, and topic -- Checking WordPress versions -- Summary -- 4. Ajax Search -- What is Ajax? -- The overall plan -- The proof of concept mock up -- Hooking up jQuery -- Test that jQuery has loaded -- What happened? -- Using the FireBug console directly -- Writing HTML dynamically to a target div -- Multi-line strings -- Viewing the generated page -- Anonymous functions -- Adding a div on the fly -- Create a listener -- Fetching data from another page -- Creating our plugin -- Creating index.php and activating the plugin -- Creating our first PHP class -- Updating index.php -- Testing your version of PHP -- Testing for searchable pages -- Adding your own CSS files -- Adding your search handler -- Adding your own JavaScript -- Handling Ajax search requests -- Formatting your search results -- Summary -- 5. Content Rotator -- The plan -- Widget overview -- Preparation -- Activating your plugin -- Activating the widget -- Having problems?.

Parents and children: extending classes -- Objects vs. libraries: when to use static functions -- Add custom text -- Adding widget options -- Generating random content -- Expiration dates: adding options to our widget -- Expiration dates: enforcing the shelf life -- Explaining the instance -- Adding a custom manager page -- Adding options to the custom manager page -- Randomizing content from the database -- Review of PHP functions used -- Summary -- 6. Standardized Custom Content -- What WordPress does for you: custom fields -- What WordPress doesn't do for you -- Standardizing a post's custom fields -- Creating a new plugin -- Removing the default WordPress form for custom fields -- Creating our own custom meta box -- Defining custom fields -- Generating custom form elements -- Saving custom content -- Having trouble saving data? -- Displaying custom data in your Templates -- Copying a theme -- Modifying the theme -- Granular display of custom fields -- Bonus for the MySQL curious -- Known limitations -- Summary -- 7. Custom Post Types -- Background: What's in a name? -- Understanding register_post_type() -- Customizing our post type -- Using shortcodes -- Testing our shortcode -- Customizing our plugin -- Creating a settings shortcut link -- Cleaning up when uninstalling -- Summary -- 8. Versioning Your Code with Subversion (SVN) -- Why Subversion? -- Understanding the terminology and concepts -- Checking out a local working copy -- SVN folder structure -- Checkout, revisited -- Setting up an SVN repository -- Checking out a local working copy of our repo -- Adding files -- Committing changes to the repository -- Overcoming errors -- Verifying the new state of your repository -- Adding more files to your repository -- Removing files from the repository -- Updating your working copy -- Tagging a version -- Reverting an entire project.

Reverting a single file -- Moving files -- Exporting your working copy -- Quick reference -- Summary -- 9. Preparing Your Plugin for Distribution -- Public enemy number one: PHP notices -- PHP short tags -- Conflicting names -- Modifying loader.php -- Testing WordPress version -- Testing PHP version -- Testing MySQL version -- Testing PHP modules -- Testing WordPress installed plugins -- Custom tests -- Unit tests -- WordPress limitations -- Health check page -- Storing test results in the database -- Death to clippy: Use sensible configurations -- Double check your interface -- Documentation -- Identify the purpose -- Learning to drive: Keeping it relevant -- Phrasebooks vs. dictionaries: Give examples -- Analogy: The three bears -- Analogy: PC load letter -- The decalog of documentation -- Summary -- 10. Publishing Your Plugin -- Internationalization and localization -- Processing each message -- Choosing a textdomain -- Best practices -- Working with formatting -- More advanced messages -- Plural vs. singular -- More complex messages -- Notes to translators -- Language files -- Creating a POT file -- Creating translations: .po files -- Loading a textdomain -- Updating a translation -- Format for the readme.txt file -- Section - installation -- Section - Frequently Asked Questions -- Section - screenshots -- New addition - videos -- Section - summary -- Requesting and using SVN access -- Publicity and promotion -- Summary -- A. Recommended Resources -- PHP reference -- Function reference -- The WordPress forums -- WebDev Studios -- Viper007Bond -- Kovshenin -- SLTaylor -- XPlus3 -- WP Engineer -- Other plugins -- B. WordPress API Reference -- PHP functions -- dirname -- file_get_contents -- preg_match -- preg_replace -- print_r -- sprintf -- strtolower -- substr -- WordPress Functions -- __ -- _e -- add_action -- add_filter -- add_meta_box.

add_options_page -- check_admin_referer -- esc_html -- get_option -- get_post_meta -- get_the_ID -- register_post_type -- remove_meta_box -- screen_icon -- the_content -- the_meta -- update_post_meta -- wp_count_posts -- wp_die -- wp_nonce_field -- Actions -- admin_init -- admin_menu -- do_meta_boxes -- init -- save_post -- widgets_init -- wp_head -- Filters -- the_content -- Index.