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Full Description
Taking WordPress to the next level with advanced plugin development WordPress is used to create self-hosted blogs and sites, and it's fast becoming the most popular content management system (CMS) on the Web. Now you can extend it for personal, corporate and enterprise use with advanced plugins and this professional development guide. Learn how to create plugins using the WordPress plugin API: utilize hooks, store custom settings, craft translation files, secure your plugins, set custom user roles, integrate widgets, work with JavaScript and AJAX, create custom post types. You'll find a practical, solutions-based approach, lots of helpful examples, and plenty of code you can incorporate!* Shows you how to develop advanced plugins for the most popular CMS platform today, WordPress * Covers plugin fundamentals, how to create and customize hooks, internationalizing your site with translation files, securing plugins, how to create customer users, and ways to lock down specific areas for use in corporate settings * Delves into advanced topics, including creating widgets and metaboxes, debugging, using JavaScript and AJAX, Cron integration, custom post types, short codes, multi site functions, and working with the HTTP API * Includes pointers on how to debug, profile and optimize your code, and how to market your custom plugin Learn advanced plugin techniques and extend WordPress into the corporate environment.
Contents
FOREWORD xxi INTRODUCTION xxiii CHAPTER 1PLUGINS 1 What Is a Plugin? 1 Available Plugins 3 Advantages of Plugins 5 Installing and Managing Plugins 7 Summary 10 CHAPTER 2: PLUGIN FOUNDATION 11 Creating a Plugin File 11 Sanity Practices 12 Header Requirements 14 Determining Paths 15 Activate/Deactivate Functions 18 Uninstall Methods 20 Coding Standards 22 Plugin Development Checklist 26 Summary 27 CHAPTER 3: HOOKS 29 Actions 30 Filters 39 Using Hooks from Within a Class 51 Creating Custom Hooks 52 How to Find Hooks 55 Summary 57 CHAPTER 4: INTEGRATING IN WORDPRESS 59 Adding Menus and Submenus 59 Creating Widgets 63 Meta Boxes 79 Keeping It Consistent 90 Summary 96 CHAPTER 5: INTERNATIONALIZATION 97 Internationalization and Localization 97 Creating Translation Files 113 Summary 115 CHAPTER 6: PLUGIN SECURITY 117 Securing Your Plugin 117 User Permissions 118 Nonces 120 Data Validation and Sanitization 127 Formatting SQL Statements 149 Security Good Habits 160 Summary 161 CHAPTER 7: PLUGIN SETTINGS 163 The Options API 163 The Settings API 169 The Transients API 180 Saving Per-User Settings 183 Storing Data in Custom Tables 191 Summary 196 CHAPTER 8: USERS 197 Working with Users 198 Roles and Capabilities 219 Limiting Access 221 Customizing Roles 229 Summary 236 CHAPTER 9: HTTP API 237 HTTP Requests Crash Course 237 WordPress HTTP Functions 242 Practice: Reading JSON from a Remote API 255 Practice: Sending Data to a Remote API 259 Practice: Reading Arbitrary Content 262 Make Your Own Plugin Repository 263 Special Case: Fetching Remote Feeds 269 Summary 270 CHAPTER 10: THE SHORTCODE API 271 Creating Shortcodes 271 Shortcode Tips 277 Integrating Google Maps 286 More Shortcode Quick Ideas 295 Summary 297 CHAPTER 11: EXTENDING POSTS: METADATA, CUSTOM POST TYPES, AND TAXONOMIES 299 Creating Custom Post Types 300 Using Custom Post Types 309 Post Metadata 313 Creating Custom Taxonomies 318 Using Custom Taxonomies 324 A Post Type and Taxonomy Plugin 329 Summary 332 CHAPTER 12: Ajax 337 Adding JavaScript in WordPress 341 Ajax in WordPress 358 Summary 373 CHAPTER 13: CRON 375 What Is Cron? 375 Scheduling Cron Events 376 True Cron 386 Practical Use 386 Summary 401 CHAPTER 14: THE REWRITE API 403 Why Rewrite URLs 403 How WordPress Handles Queries 406 Practical Uses 408 Summary 423 CHAPTER 15: MULTISITE 425 Differences 426 Enabling Multisite in WordPress 427 Multisite Functions 428 Multisite Database Schema 460 Summary 461 CHAPTER 16: DEBUGGING AND OPTIMIZING 463 Supporting Old Versions (Not) 463 Debugging 466 Error Logging 472 Caching 473 Summary 477 CHAPTER 17: MARKETING YOUR PLUGIN 479 Choosing a License for Your Plugin 480 Submitting to WordPress.org 482 Getting Your Plugin Renowned 489 Summary 496 CHAPTER 18: THE DEVELOPER TOOLBOX 497 Core as Reference 497 Codex 501 Tool Web Sites 502 PHPXref 502 Community Resources 503 Tools 507 Summary 509 INDEX 511
