وردپرس یک سیستم مدیریت محتوا برای سایت‌ها و وبلاگ‌ها می‌باشد. وردپرس در ابتدا تنها یک سیستم رایگان وبلاگ نویسی بود که امکانات خوبی را در اختیار وبلاگ نویسان قرار می‌داد و سپس به صورت یک CMS یا نرم‌افزار کدباز برای مدیریت محتوای سایت‌ها معرفی شد.

سایت‌های وردپرسی با استفاده از افزونه‌های نوشته شده برای وردپرس می‌توانند انواع امکانات را دربرگیرند. به عنوان مثال برای راه اندازی یک فروشگاه اینترنتی در کنار سایت وردپرسی کافیست یکی از افزونه‌هایی که برای این منظور طراحی شده‌اند را به هسته وردپرس خود اضافه کنید. به عنوان مثال افزونه‌های WooCommerce و Edd دو افزونه وردپرس هستند که برای راه اندازی فروشگاه اینترنتی جهت فروش کالای فیزیکی یا فایل‌های دانلودی استفاده می‌شوند. همچنین قابلیت تبدیل شدن سایت به یک شبکه اجتماعی با افزونه قدرتمند buddypress و یا ایجاد یک تالار گفتگو یا انجمن با افزونه bbpress، در وردپرس وجود دارد. با توجه به فراوانی و تنوع افزونه‌های وردپرس تقریباً هر امکانی را می‌توان به سایت وردپرسی اضافه کرد.

وردپرس با زبان برنامه‌نویسی پی اچ پی نوشته شده و توسط مای‌اس‌کیوال پشتیبانی می‌شود. همچنین نسخه‌ای برای پست‌گرس‌کیوال نیز موجود می‌باشد این سیستم کاملاً رایگان و متن باز است.

وردپرس در ادامه راه پروژهٔ موفق b۲ است که در سال ۲۰۰۳ شکل گرفت. نام وردپرس را کریستیان اِسلِک، دوست مت مولنوگ (توسعه‌دهندهٔ اصلی وردپرس) پیش نهاد و از آن روز وردپرس با سرعت و پیشرفتی قابل ملاحظه تبدیل به معروف‌ترین و پرکاربردترین ابزار ساخت وبلاگ و سایت بر روی هاست شده‌است.

در هنگام وارد کردن اطلاعات ایمیل خود را برای دربافت فیلم های آموزشی رایگان وردپرس وارد کنید .

سر فصل های کتاب:

CHAPTER 1: AN INTRODUCTION TO PLUGINS 1
What Is a Plugin? 1
How Plugins Interact with WordPress 2
When Are Plugins Loaded? 3
Available Plugins 3
Offi cial Plugin Directory 3
Popular Plugin Examples 4
Popular Plugin Tags 4
Advantages of Plugins 5
Not Modifying Core 5
Why Reinvent the Wheel 5
Separating Plugins and Themes 6
Easy Updates 6
Easier to Share and Reuse 7
Plugin Sandbox 7
Plugin Community 7
Installing and Managing Plugins 7
Installing a Plugin 7
Managing Plugins 8
Editing Plugins 8
Plugin Directories 8
Types of Plugins 9
Testing Plugin Functionality 10
Summary 10
CHAPTER 2: PLUGIN FOUNDATION 11
Creating a Plugin File 11
Naming Your Plugin 11
Using a Folder 12
Sanity Practices 12
Prefi x Everything 12
File Organization 13
Folder Structure 13



Header Requirements 14
Creating the Header 14
Plugin License 15
Determining Paths 15
Plugin Paths 15
Local Paths 16
URL Paths 17
Activate/Deactivate Functions 18
Plugin Activation Function 18
Create Default Settings on Activate 19
Plugin Deactivation Function 19
Deactivate Is Not Uninstall 20
Uninstall Methods 20
Why Uninstall Is Necessary 20
Uninstall.php 21
Uninstall Hook 21
Coding Standards 22
Document Your Code 23
Naming Variables, Functions, and Files 23
Single and Double Quotes 24
Indentation 24
Brace Style 25
Space Usage 25
Shorthand PHP 26
SQL Statements 26
Plugin Development Checklist 26
Summary 27
CHAPTER 3: HOOKS 29
Actions 30
What Is an Action? 31
Action Hook Functions 32
Commonly Used Action Hooks 36
Filters 39
What Is a Filter? 40
Filter Hook Functions 41
Quick Return Functions 46
Commonly Used Filter Hooks 47
Using Hooks from Within a Class 51
Creating Custom Hooks 52
Benefi ts of Creating Custom Hooks 53


Custom Action Hook Example 53
Custom Filter Hook Example 54
How to Find Hooks 55
Searching for Hooks in the Core Code 56
Variable Hooks 56
Hook Reference Lists 56
Summary 57
CHAPTER 4: INTEGRATING IN WORDPRESS 59
Adding Menus and Submenus 59
Creating a Top-Level Menu 60
Adding a Submenu 61
Adding a Menu Item to an Existing Menu 62
Creating Widgets 63
Creating a Widget 63
Advanced Widget 68
Creating Dashboard Widgets 74
Creating a Dashboard Widget with Options 75
Meta Boxes 79
Adding a Custom Meta Box 79
Saving Meta Box Data 80
Advanced Meta Box 84
Keeping It Consistent 90
Using the WordPress UI 90
Headings 90
Icons 91
Messages 91
Buttons 92
Links 93
Form Fields 93
Tables 94
Pagination 95
Summary 96
CHAPTER 5: INTERNATIONALIZATION 97
Internationalization and Localization 97
Why Internationalize? 98
Understanding Internationalization in Professional Work 98
Getting Your Plugin Ready for Translation 99
Echoing and Returning Strings 99



Using Placeholders 108
Internationalizing JavaScript 110
Creating Translation Files 113
The MO and PO Files 113
Translation Tools 113
How to Create a POT File 114
Where to Store Translation Files 115
Summary 115
CHAPTER 6: PLUGIN SECURITY 117
Securing Your Plugin 117
What Securing Your Plugin Is 118
What Securing Your Plugin Is Not 118
User Permissions 118
How to Check current_user_can() 118
Do Not Check Too Early 119
Nonces 120
Authority Versus Intention 120
What Is a Nonce? 121
How to Create and Verify Nonces 122
Nonces in Ajax Scripts 127
Data Validation and Sanitization 127
The Need for Data Validation and Sanitization 127
Good Practice: Identifying Potentially Tainted Data 129
Validating or Sanitizing Input? 130
Validating and Sanitizing Cookbook 131
Formatting SQL Statements 149
The $wpdb Object 149
Why wpdb Methods Are Superior 150
All-in-One Methods 151
Common Methods 153
Protecting Queries Against SQL Injections 157
Miscellaneous wpdb Methods and Properties 159
Security Good Habits 160
Summary 161
CHAPTER 7: PLUGIN SETTINGS 163
The Options API 163
Saving Options 164
Saving an Array of Options 164
Retrieving Options 165



Loading an Array of Options 166
Deleting Options 167
The Autoload Parameter 167
The Settings API 169
Benefi ts of the Settings API 169
Settings API Functions 169
Wrapping It Up: A Complete Plugin Management Page 174
Improving Feedback on Validation Errors 176
Adding Fields to an Existing Page 177
The Transients API 180
Saving an Expiring Option 181
Retrieving an Expiring Option 181
Deleting an Expiring Option 181
A Practical Example Using Transients 182
Technical Details 182
Transient Ideas 183
Saving Per-User Settings 183
Crafting a Plugin 183
User Metadata 183
Saving User Metadata 184
Updating User Metadata 184
Getting User Metadata 185
Deleting User Metadata 185
Getting a User’s ID 186
Adding Input Fields to a Profi le Page 186
BOJ’s Admin Lang Plugin 188
Per-User Settings: Best Practices 190
Storing Data in Custom Tables 191
Types of Data 191
WordPress’ Standard Tables 191
Creating a Custom Table 191
Updating the Structure of a Custom Table 193
dbDelta() Tips for Success 194
Accessing Your Custom Table 196
Summary 196
CHAPTER 8: USERS 197
Working with Users 198
User Functions 198
Creating, Updating, and Deleting Users 202
User Data 207



User Metadata 212
Roles and Capabilities 219
What Are Roles and Capabilities? 220
Default Roles 220
Custom Roles 221
Limiting Access 221
Checking User Permissions 222
Is the User an Admin? 226
Allowing Custom Permissions 227
Customizing Roles 229
Creating a Role 229
Deleting a Role 230
Adding Capabilities to a Role 231
Removing Capabilities from a Role 232
A Custom Role and Capability Plugin 233
Summary 236
CHAPTER 9: HTTP API 237
HTTP Requests Crash Course 237
What Is an HTTP Request? 237
How to Make HTTP Requests in PHP 240
WordPress’ HTTP Functions 242
The wp_remote_ Functions 242
Advanced Confi guration and Tips 248
Practice: Reading JSON from a Remote API 255
Getting and Reading JSON 256
Your Functional Plugin 257
Practice: Sending Data to a Remote API 259
Formatting Parameters for POST Requests 259
Your Functional Plugin 260
Practice: Reading Arbitrary Content 262
Make Your Own Plugin Repository 263
How Plugin Upgrades Work in WordPress 263
Polling an Alternative API from a Plugin 264
Building the Alternative API 268
A Few Words of Caution About Self-Hosted API 269
Special Case: Fetching Remote Feeds 269
Summary 270
CHAPTER 10: THE SHORTCODE API 271
Creating Shortcodes 271
What Shortcodes Are 271



Register Custom Shortcodes 273
Shortcode Tips 277
Think Simplicity for the User 277
Remember the Dynamicity 280
Look Under the Hoods 281
A “bb code” for Comments Plugin 283
Shortcode Nesting Limitations 286
Integrating Google Maps 286
Accessing the Google Geocoding API 287
Storing API Results 288
Accessing the Google Maps API 290
More Shortcode Quick Ideas 295
Display Member-Only Content 295
Display Time-Limited Content 296
Obfuscate Email Addresses 296
Summary 297
CHAPTER 11: EXTENDING POSTS: METADATA,
CUSTOM POST TYPES, AND TAXONOMIES 299
Creating Custom Post Types 300
Post Type Possibilities 300
Registering a Post Type 300
Setting Post Type Labels 305
Using Custom Capabilities 306
Attaching Existing Taxonomies 308
Using Custom Post Types 309
Creating a Custom Post Type Loop 309
Retrieving Custom Post Type Content 311
Checking if a Post Type Exists 312
Post Metadata 313
Adding Post Metadata 314
Retrieving Post Metadata 315
Updating Post Metadata 316
Deleting Post Metadata 317
Creating Custom Taxonomies 318
Understanding Taxonomies 318
Registering a Custom Taxonomy 319
Assigning a Taxonomy to a Post Type 323
Using Custom Taxonomies 324
Retrieving a Taxonomy 324
Using a Taxonomy with Posts 325
Taxonomy Conditional Tags 327



A Post Type and Taxonomy Plugin 329
Summary 332
CHAPTER 12: JAVASCRIPT AND AJAX IN WORDPRESS 333
jQuery–A Brief Introduction 333
Benefi ts of Using jQuery 334
jQuery Crash Course 334
Ajax 337
What Is Ajax? 338
Ajax Best Practices 341
Adding JavaScript in WordPress 341
A Proper Way to Include Scripts 341
Where to Include Scripts 348
Adding Scripts Only When Needed 350
Dynamic Scripts in WordPress 354
Ajax in WordPress 358
Ajax in WordPress: Principles 358
A Complete Example: Instant “Read More” Links 360
Another Example: Frontend Comment Deletion 367
Debugging Ajax 372
Summary 373
CHAPTER 13: CRON 375
What Is Cron? 375
How Is Cron Executed? 375
Scheduling Cron Events 376
Scheduling a Recurring Event 376
Scheduling a Single Event 379
Unscheduling an Event 381
Specifying Your Own Cron Intervals 382
Viewing Cron Events Scheduled 382
True Cron 386
Practical Use 386
Deleting Post Revisions Weekly 386
The Blog Pester Plugin 391
The Delete Comments Plugin 395
Summary 401
CHAPTER 14: THE REWRITE API 403
Why Rewrite URLs 403
Permalink Principles 404



Apache’s mod_rewrite 404
URL Rewriting in WordPress 405
How WordPress Handles Queries 406
Overview of the Query Process 406
The rewrite Object 407
The query Object 407
What Plugins Can Do 408
Practical Uses 408
Rewriting a URL to Create a List of Shops 408
Creating a New Permalink Structure and Integrating
Non-WordPress Pages 415
Adding an Endpoint and Altering Output Format 417
Adding a Custom Feed for the Latest Uploaded Images 421
Summary 423
CHAPTER 15: MULTISITE 425
Diff erences 426
WordPress Versus Multisite Network 426
Understanding Multisite Terminology 426
Advantages of Multisite 427
Enabling Multisite in WordPress 427
Multisite Functions 428
The Power of Blog ID 428
Common Functions 429
Switching and Restoring Sites 431
Network Content Shortcode Examples 434
A Network Content Widget Example 440
Creating a New Site 446
Multisite Site Options 452
Users in a Network 453
Multisite Super Admin 457
Checking the Site Owner 458
Network Stats 459
Multisite Database Schema 460
Multisite-Specifi c Tables 460
Site-Specifi c Tables 460
Summary 461
CHAPTER 16: DEBUGGING AND OPTIMIZING 463
Supporting Old Versions (Not) 463
Keeping Current with WordPress Development 464



Deprecated Functions 465
Dealing with Obsolete Client Installs 466
Debugging 466
Enabling Debugging 467
Displaying Debug Messages 467
Correcting Debug Messages 468
Error Logging 472
Enabling Logging 472
Setting Log File Location 473
Understanding the Log File 473
Caching 473
Saving, Loading, and Deleting Cached Data 474
Caching Data Within a Plugin 475
Summary 477
CHAPTER 17: MARKETING YOUR PLUGIN 479
Choosing a License for Your Plugin 480
Diff erent Options 480
Why It Matters 481
Making Money While Using the GPL 482
Submitting to WordPress.org 482
Creating an Account 484
Submitting a Plugin 484
Setting Up SVN 485
Creating a readme.txt File 486
Getting Your Plugin Renowned 489
Naming Your Plugin 489
Building a Web Site 491
Creating a Page for Your Plugin 492
Announcing Your Plugin 493
Supporting Your Plugins 493
Getting Feedback 494
Getting Out of the Basement 495
Other Promotion Methods 495
Summary 496
CHAPTER 18: THE DEVELOPER TOOLBOX 497
Core as Reference 497
Inline Documentation 497
Finding Functions 499
Common Core Files 499

Codex 501
Searching the Codex 501
Function Reference 501
Tool Web Sites 502
PHPXref 502
Hooks Database 503
Community Resources 503
Support Forums 503
Mailing Lists 504
WordPress Chat 504
WordPress Development Updates 505
WordPress Ideas 505
Community News Sites 505
Local Events 506
Tools 507
Browser 507
Editor 507
Deploying Files with FTP, SFTP, and SSH 508
phpMyAdmin 508
Summary 509
INDEX 511