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1. Foreword
2. Preface
a. Who This Book Is For
b. Who This Book Is Not For
c. What You’ll Learn
d. About the Code
e. Conventions Used in This Book
f. Using Code Examples
g. O’Reilly Online Learning
h. How to Contact Us
i. Acknowledgments
3. 1. Building Web Apps with WordPress
a. What Is a Website?
b. What Is an App?
c. What Is a Web App?
i. Features of a Web App
ii. Mobile Apps
iii. Progressive Web Apps
d. Why Use WordPress?
i. You Are Already Using WordPress
ii. Content Management Is Easy with
WordPress

iii. User Management Is Easy and Secure
with WordPress
iv. Plugins
v. Flexibility Is Important
vi. Frequent Security Updates
vii. Cost
viii. Responses to Some Common Criticisms
of WordPress
e. When Not to Use WordPress
i. You Plan to License or Sell Your Site’s
Technology
ii. Another Platform Will Get You “There”
Faster
iii. Flexibility Is Not Important to You
iv. Your App Needs to Be Highly Real
Time
f. WordPress as an Application Framework
i. WordPress Versus Model-View-
Controller Frameworks
g. Anatomy of a WordPress App
i. What Is SchoolPress?
ii. SchoolPress Runs on a WordPress
Multisite Network
iii. The SchoolPress Business Model
iv. Membership Levels and User Roles

v. Classes Are BuddyPress Groups
vi. Assignments Are a CPT
vii. Submissions Are a (Sub)CPT for
Assignments
viii. Semesters Are a Taxonomy on the Class
CPT
ix. Departments Are a Taxonomy on the
Class CPT
x. SchoolPress Has One Main Custom
Plugin
xi. SchoolPress Uses a Few Other Custom
Plugins
xii. SchoolPress Uses the Memberlite
Theme
4. 2. WordPress Basics
a. WordPress Directory Structure
i. Root Directory
ii. /wp-admin
iii. /wp-includes
iv. /wp-content
b. WordPress Database Structure
i. wp_options
ii. Functions Found in /wp-
includes/option.php
iii. wp_users

iv. Functions Found in /wp-includes/…
v. wp_usermeta
vi. wp_posts
vii. Functions Found in /wp-
includes/post.php
viii. wp_postmeta
ix. Functions Found in /wp-
includes/post.php
x. wp_comments
xi. Functions Found in /wp-
includes/comment.php
xii. wp_commentsmeta
xiii. Functions Found in /wp-
includes/comment.php
xiv. wp_terms
xv. Functions Found in /wp-
includes/taxonomy.php
xvi. wp_termmeta
xvii. wp_term_taxonomy
xviii. /wp-includes/taxonomy.php
xix. wp_term_relationships
c. Hooks: Actions and Filters
i. Actions
ii. Filters

d. Development and Hosting Environments
i. Working Locally
ii. Choosing a Web Host
iii. Development, Staging, and Production
Environments
e. Extending WordPress
5. 3. Using WordPress Plugins
a. The General Public License, Version 2, License
b. Installing WordPress Plugins
c. Building Your Own Plugin
d. File Structure for an App Plugin
i. /adminpages/
ii. /classes/
iii. /css/
iv. /js/
v. /images/
vi. /includes/
vii. /includes/lib/
viii. /pages/
ix. /services/
x. /scheduled/
xi. /schoolpress.php
e. Add-Ons to Existing Plugins

f. Use Cases and Examples
i. The WordPress Loop
ii. WordPress Global Variables
g. Free Plugins
i. Admin Columns
ii. Advanced Custom Fields
iii. BadgeOS
iv. Posts 2 Posts
v. Members
vi. W3 Total Cache
vii. Yoast SEO
h. Premium Plugins
i. Gravity Forms
ii. BackupBuddy
iii. WP All Import
i. Community Plugins
i. BuddyPress
6. 4. Themes
a. Themes Versus Plugins
i. Where to Place Code When Developing
Apps
ii. When Developing Plugins

iii. Where to Place Code When Developing
Themes
b. The Template Hierarchy
c. Page Templates
i. Sample Page Template
ii. Using Hooks to Copy Templates
iii. When Should You Use a Theme
Template?
d. Theme-Related WordPress Functions
i. Using locate_template in Your Plugins
e. Style.css
i. Versioning Your Theme’s CSS Files
f. functions.php
g. Themes and CPTs
h. Popular Theme Frameworks
i. WordPress Theme Frameworks
ii. Non-WordPress Theme Frameworks
i. Creating a Child Theme for Memberlite
j. Including Bootstrap in Your App’s Theme
k. Menus
i. Navigation Menus
ii. Dynamic Menus
l. Responsive Design

i. Device and Display Detection in CSS
ii. Device and Feature Detection in
JavaScript
iii. Device Detection in PHP
iv. Final Note on Browser Detection
7. 5. Custom Post Types, Post Metadata, and Taxonomies
a. Default Post Types and CPTs
i. Page
ii. Post
iii. Attachment
iv. Revisions
v. Navigation Menu Item
vi. Custom CSS
vii. Changesets
viii. oEmbed Cache
ix. User Requests
x. Reusable Blocks
b. Defining and Registering CPTs
i. register_post_type( $post_type, $args
);
c. What Is a Taxonomy and How Should I Use It?
i. Taxonomies Versus Post Meta
ii. Creating Custom Taxonomies

iii. register_taxonomy( $taxonomy,
$object_type, $args )
iv. register_taxonomy_for_object_type(
$taxonomy, $object_type )
d. Using CPTs and Taxonomies in Your Themes
and Plugins
i. The Theme Archive and Single
Template Files
ii. Good Old WP_Query and get_posts()
e. Metadata with CPTs
i. add_meta_box( $id, $title, $callback,
$screen, $context, $priority,
$callback_args )
ii. Using Meta Boxes with the Block
Editor
f. Custom Wrapper Classes for CPTs
i. Extending WP_Post Versus Wrapping
It
ii. Why Use Wrapper Classes?
iii. Keep Your CPTs and Taxonomies
Together
iv. Keep It in the Wrapper Class
v. Wrapper Classes Read Better
8. 6. Users, Roles, and Capabilities
a. Getting User Data

b. Add, Update, and Delete Users
c. Hooks and Filters
d. What Are Roles and Capabilities?
i. Checking a User’s Role and Capabilities
ii. Creating Custom Roles and Capabilities
e. Extending the WP_User Class
f. Adding Registration and Profile Fields
g. Customizing the Users Table in the Dashboard
h. Plugins
i. Theme My Login
ii. Hide the Admin Bar from
Nonadministrators
iii. Paid Memberships Pro
iv. PMPro Register Helper
v. Members
vi. WP User Fields
9. 7. Working with WordPress APIs, Objects, and Helper
Functions
a. Shortcode API
i. Shortcode Attributes
ii. Nested Shortcodes
iii. Removing Shortcodes

iv. Other Useful Shortcode-Related
Functions
b. Widgets API
i. Before You Add Your Own Widget
ii. Adding Widgets
iii. Defining a Widget Area
iv. Embedding a Widget Outside of a
Dynamic Sidebar
c. Dashboard Widgets API
i. Removing Dashboard Widgets
ii. Adding Your Own Dashboard Widget
d. Settings API
i. Do You Really Need a Settings Page?
ii. Could You Use a Hook or Filter
Instead?
iii. Use Standards When Adding Settings
iv. Ignore Standards When Adding
Settings
e. Rewrite API
i. Adding Rewrite Rules
ii. Flushing Rewrite Rules
iii. Other Rewrite Functions
f. WP-Cron

i. Adding Custom Intervals
ii. Scheduling Single Events
iii. Kicking Off Cron Jobs from the Server
iv. Using Server Crons Only
g. WP Mail
i. Sending Nicer Emails with WordPress
h. File Header API
i. Adding File Headers to Your Own Files
ii. Adding New Headers to Plugins and
Themes
i. Heartbeat API
10. 8. Secure WordPress
a. Why It’s Important
b. Security Basics
i. Update Frequently
ii. Don’t Use the Username “admin”
iii. Use a Strong Password
iv. Examples of Bad Passwords
v. Examples of Good Passwords
c. Hardening WordPress
i. Don’t Allow Admins to Edit Plugins or
Themes
ii. Change Default Database Tables Prefix

iii. Move wp-config.php
iv. Hide Login Error Messages
v. Hide Your WordPress Version
vi. Don’t Allow Logins via wp-login.php
vii. Add Custom .htaccess Rules for
Locking Down wp-admin
d. SSL Certificates and HTTPS
i. Installing an SSL Certificate on Your
Server
ii. WordPress Login and WordPress
Administrator over SSL
iii. Debugging HTTPS Issues
iv. Avoiding SSL Errors with the “Nuclear
Option”
e. Back Up Everything!
f. Scan, Scan, Scan!
g. Useful Security Plugins
i. Spam-Blocking Plugins
ii. Backup Plugins
iii. Firewall/Scanner Plugins
iv. Login and Password-Protection Plugins
h. Writing Secure Code
i. Check User Capabilities
ii. Custom SQL Statements

iii. Data Validation, Sanitization, and
Escaping
iv. Nonces
11. 9. JavaScript Frameworks and Workflow
a. What Is ECMAScript?
b. What Is ES6?
c. What Is ES9?
d. What Is ESNext?
e. What Is Ajax?
f. What Is JSON?
g. jQuery and WordPress
i. Enqueuing Other JavaScript Libraries
ii. Where to Put Your Custom JavaScript
h. Ajax Calls with WordPress and jQuery
i. Managing Multiple Ajax Requests
j. Heartbeat API
k. WordPress Limitations with Asynchronous
Processing
l. JavaScript Frameworks
i. Backbone.js
ii. React
12. 10. WordPress REST API
a. What Is a REST API?

i. API
ii. REST
iii. JSON
iv. HTTP
b. Why Use the WordPress REST API?
c. Using the WordPress REST API V2
i. Discovery
ii. Authentication
iii. Routes and Endpoints
iv. Requests
v. Responses
d. Adding Your Own Routes and Endpoints
i. register_rest_route( $namespace,
$route, $args, $override );
ii. Setting Up the WordPress Single Sign-
On Plugin
iii. Adding the /wp-sso/v1/check Route
iv. Bundling Basic Authentication with
Our Plugin
v. Using the Endpoint We Set Up to
Check User Credentials
e. Popular Plugins Using the WordPress REST
API
i. WooCommerce

ii. BuddyPress
iii. Paid Memberships Pro
13. 11. Project Gutenberg, Blocks, and Custom Block Types
a. The WordPress Editor
b. The Classic Editor Plugin
c. Using Blocks for Content and Design
d. Using Blocks for Functionality
e. Creating Your Own Blocks
i. Minimal Block Example
f. Using Custom Blocks to Build App Experiences
i. Enabling the Block Editor in Your CPTs
ii. Block Categories
iii. The Homework Blocks
iv. Limiting Blocks to Specific CPTs
v. Limiting CPTs to Specific Blocks
vi. Block Templates
vii. Saving Block Data to Post Meta
g. Tips
i. Enable WP_SCRIPT_DEBUG
ii. Use filemtime() for the Script Version
iii. More Tips
iv. Learn JavaScript, Node.js, and React
More Deeply

14. 12. WordPress Multisite Networks
a. Why Multisite?
b. Why Not Multisite?
c. Multisite Alternatives
i. Multiple Authors or Categories on the
Same WordPress Site
ii. Custom Post Types
iii. Totally Separate Sites
iv. Use a WordPress Maintenance Service
v. Multitenancy
d. Setting Up a Multisite Network
e. Managing a Multisite Network
i. Dashboard
ii. Sites
iii. Users
iv. Themes
v. Plugins
vi. Settings
vii. Updates
f. Multisite Database Structure
i. Networkwide Tables
ii. Individual Site Tables
iii. Shared Site Tables

g. Domain Mapping
h. Random Useful Multisite Plugins
i. Gravity Forms User Registration Add-
On
ii. Member Network Sites Add-On for
Paid Memberships Pro
iii. More Privacy Options
iv. Multisite Global Media
v. Multisite Plugin Manager
vi. Multisite Global Search
vii. Multisite Robots.txt Manager
viii. NS Cloner: Site Copier
ix. WP Multi Network
i. Basic Multisite Functionality
i. $blog_id
ii. is_multisite()
iii. get_current_blog_id()
iv. switch_to_blog( $new_blog )
v. restore_current_blog()
vi. get_blog_details( $fields = null,
$get_all = true )
vii. update_blog_details( $blog_id,
$details = array() )
viii. get_blog_status( $id, $pref )

ix. update_blog_status( $blog_id, $pref,
$value )
x. get_blog_option( $id, $option,
$default = false )
xi. update_blog_option( $id, $option,
$value )
xii. delete_blog_option( $id, $option )
xiii. get_blog_post( $blog_id, $post_id )
xiv. add_user_to_blog( $blog_id,
$user_id, $role )
xv. wpmu_delete_user( $user_id )
xvi. create_empty_blog( $domain, $path,
$weblog_title, $site_id = 1 )
xvii. Functions We Didn’t Mention
15. 13. Localizing WordPress Apps
a. Do You Even Need to Localize Your App?
b. How Localization Is Done in WordPress
c. Defining Your Locale in WordPress
d. Text Domains
i. Setting the Text Domain
e. Prepping Your Strings with Translation
Functions
i. __( $text, $domain = “default” )
ii. _e( $text, $domain = “default” )

iii. _x( $text, $context, $domain =
“default” )
iv. _ex( $title, $context, $domain =
“default” )
v. Escaping and Translating at the Same
Time
f. Creating and Loading Translation Files
i. Our File Structure for Localization
ii. Generating a .pot File
iii. Creating a .po File
iv. Creating a .mo File
g. GlotPress
i. Using GlotPress for Your
WordPress.org Plugins and Themes
ii. Creating Your Own GlotPress Server
16. 14. WordPress Optimization and Scaling
a. Terms
b. Origin Versus Edge
c. Testing
i. What to Test
ii. Chrome Debug Bar
iii. The WordPress Site Health Tool
iv. Apache Bench
v. Siege

d. W3 Total Cache
i. Page Cache Settings
ii. Minify
iii. Database Caching
iv. Object Cache
v. CDNs
vi. GZIP Compression
e. Hosting
i. WordPress-Specific Hosts
ii. Rolling Your Own Server
f. Selective Caching
i. The Transient API
ii. Multisite Transients
g. Using JavaScript to Increase Performance
h. Custom Tables
i. Bypassing WordPress
17. 15. Ecommerce
a. Choosing a Plugin
i. WooCommerce
ii. Paid Memberships Pro
iii. Easy Digital Downloads
b. Payment Gateways

c. Merchant Accounts
d. Setting Up SaaS with Paid Memberships Pro
e. The SaaS Model
i. Step 0: Establishing How You Want to
Charge for Your App
ii. Step 1: Installing and Activating Paid
Memberships Pro
iii. Step 2: Setting Up the Level
iv. Step 3: Setting Up Pages
v. Step 4: Choosing Payment Settings
vi. Step 5: Choosing Email Settings
vii. Step 6: Choosing Advanced Settings
viii. Step 7: Locking Down Pages
ix. Step 8: Customizing Paid Memberships
Pro
18. 16. Mobile Apps Powered by WordPress
a. Mobile App Use Cases
b. Native and Hybrid Mobile Apps
i. What Is a Native Mobile App?
ii. What Is a Hybrid Mobile App?
iii. Why Hybrid over Native?
iv. Cordova
v. Ionic Framework

vi. App Wrapper
vii. AppPresser
19. 17. PHP Libraries, Web Service Integrations, and
Platform Migrations
a. PHP Libraries
i. Image Generation and Manipulation
ii. PDF Generation
iii. Geolocation and Geotargeting
iv. File Compression and Archiving
v. Developer Tools
b. External APIs and Web Services
i. Elasticsearch
ii. ElasticPress by 10up
iii. Google Vision
iv. Google Maps
v. Google Translate
vi. Twilio
vii. Other Popular APIs
c. Migrations
i. Host Migrations
ii. Platform Migrations
iii. Create a Data Mapping Guide
20. 18. The Future

a. Where We’ve Been
b. The REST API
i. WordPress Plugins Will Focus More on
APIs
ii. Headless WordPress
iii. GraphQL
c. Gutenberg
i. The Administrator Interface Will Move
to React/Gutenberg
ii. Gutenberg Will Power a Frontend
Editing Experience for WordPress
iii. Block Templates Will Replace Themes
iv. Blocks Will Replace Plugins
d. WordPress Market Share Will Increase and
Decrease
e. WordPress Will Become a More Popular
Platform for Mobile Development
f. WordPress Will Continue to Be Useful for
Developing Apps of All Kinds
21. Index

Praise for Building Web Apps with WordPress, Second
Edition
“WordPress is more than just software, it’s a movement that
is becoming the de facto operating system of the web. More
than just a blog or a CMS, when you learn how to use
WordPress as an application platform you’ll be at the
forefront of the third wave of its growth.”
—Matt Mullenweg, Cofounder of WordPress
“Brian and Jason have grown side by side with WordPress for
years, and successfully demonstrate how, for the right kind
of app, developers can leverage that engine to build more
secure, more performant applications in half the time.”
—Jake Goldman, President and Founder of 10up
"Building Web Apps with WordPress is a great resource for
developers looking to learn or currently working with the
PHP-oriented approach to creating WordPress web apps.”
—Dave Mackey, Web/Software Developer, Liquid
Church

Building Web Apps with
WordPress
WordPress as an Application Framework
SECOND EDITION
Brian Messenlehner and Jason Coleman

Building Web Apps with WordPress
by Brian Messenlehner and Jason Coleman
Copyright © 2020 Brian Messenlehner and Jason Coleman. All
rights reserved.
Printed in the United States of America.
Published by O’Reilly Media, Inc., 1005 Gravenstein Highway
North, Sebastopol, CA 95472.
O’Reilly books may be purchased for educational, business, or
sales promotional use. Online editions are also available for
most titles (http://oreilly.com). For more information, contact
our corporate/institutional sales department: 800-998-9938 or
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Acquisitions Editor: Jennifer Pollock
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Production Editor: Deborah Baker
Copyeditor: Octal Publishing, LLC
Proofreader: Rachel Monaghan
Interior Designer: David Futato

Cover Designer: Karen Montgomery
Illustrator: Rebecca Demarest
April 2014: First Edition
December 2019: Second Edition
Revision History for the Second Edition
2019-12-11: First Release
See http://oreilly.com/catalog/errata.csp?isbn=9781491990087
for release details.
The O’Reilly logo is a registered trademark of O’Reilly Media,
Inc. Building Web Apps with WordPress, the cover image, and
related trade dress are trademarks of O’Reilly Media, Inc.
While the publisher and the authors have used good faith
efforts to ensure that the information and instructions
contained in this work are accurate, the publisher and the
authors disclaim all responsibility for errors or omissions,
including without limitation responsibility for damages resulting
from the use of or reliance on this work. Use of the information
and instructions contained in this work is at your own risk. If
any code samples or other technology this work contains or
describes is subject to open source licenses or the intellectual
property rights of others, it is your responsibility to ensure that
your use thereof complies with such licenses and/or rights.
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