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Home > Web Development > CMS > WordPress Web Application Development - Second Edition
WordPress Web Application Development - Second Edition
WordPress Web Application Development - Second Edition

WordPress Web Application Development - Second Edition: Build rapid web applications with cutting-edge technologies using WordPress

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WordPress Web Application Development - Second Edition

Chapter 2. Implementing Membership Roles, Permissions, and Features

The success of any web application or website depends heavily on its user base. There are plenty of great web applications that go unnoticed by many people due to the lack of user interaction. As developers, it's our responsibility to build a simple and interactive user management process, as visitors decide whether to stay on or leave a website by looking at the complexity of initial tasks such as registration and login.

In this chapter, we will be mainly concentrating on adapting existing user management functionalities into typical web applications. In order to accomplish our goal, we will execute some tasks outside the box to bring user management features from WordPress core to WordPress themes.

While striving to build a better user experience, we will also take a look at someadvanced aspects of web application development such as routing, controlling, and custom templating.

In this chapter, we will cover...

Introduction to user management

Usually, popular PHP development frameworks such as Zend, CakePHP, CodeIgniter, and Laravel don't provide a built-in user module. Developers tend to build their own user management modules and use it across many projects of the same framework. WordPress offers a built-in user management system to cater to common user management tasks found in web applications. Such things include the following:

  • Managing user roles and capabilities
  • A built-in user registration functionality
  • A built-in user login functionality
  • A built-in forgot password functionality

Developers are likely to encounter these tasks in almost all web applications. In most cases, these features and functions can be effectively used without significant changes in the code. However, web applications are much more advanced and hence, we might need various customizations on these existing features. It's important to explore the possibility of extending these functions in order to be compatible...

Getting started with user roles

In simple terms, user roles define the types of users in a system. WordPress offers built-in functions for working with every aspect of user roles. In this section, we will look at how we can manage these tasks by implementing the user roles for our application. We can create a new user role by calling the add_role function. The following code illustrates the basic form of user role creation:

$result = add_role( 'role_name', 'Display Name', array( 'read' => true, 'edit_posts' => true, 'delete_posts' => false ) );

The first parameter takes the role name, which is a unique key to identify the role. The second parameter will be the display name, which will be shown in the admin area. The final parameter will take the necessary capabilities of the user role. You can find out more about existing user roles at http://codex.wordpress.org/Roles_and_Capabilities. In this scenario, read, edit_posts, and delete_posts...

Understanding user capabilities

Capabilities can be considered as tasks, which users are permitted to perform inside the application. A single user role can perform many capabilities, while a single capability can be performed by many user roles. Typically, we use the term access control for handling capabilities in web applications. Let's see how capabilities work inside WordPress.

Creating your first capability

Capabilities are always associated with user roles and hence, we cannot create new capabilities without providing a user role. Let's look at the following code for associating custom capability with a follower user role, created in the earlier section, Creating application user roles:

public function add_application_user_capabilities(){
  $role = get_role( 'follower' );
  $role->add_cap( 'follow_developer_activities' );
}

First, we need to retrieve the user role as an object using the get_role function. Then, we can associate new or existing capability...

Registering application users

An administration panel is built into the WordPress framework, allowing us to log in through the admin screen. Therefore, we have a registration area, which can be used to add new users by providing a username and e-mail. In web applications, registration can become complex, compared to the simple registration process in WordPress. Let's consider some typical requirements of web application registration process in comparison with WordPress:

  • User-friendly interface: An application can have different types of user roles. Until registration is completed, everyone is treated as a normal application user with the ability to view public content. Typically, users are used to seeing fancy registration forms inside the main site rather than a completely different login area such as with WordPress. Therefore, we need to explore the possibilities of adding WordPress registration to the frontend.
  • Requesting detailed information: Most web applications will have at least...

Implementing frontend registration

Fortunately, we can make use of the existing functionalities to implement registration from the frontend. We can use a regular HTTP request or AJAX-based technique to implement this feature. In this book, I will focus on a normal process instead of using AJAX. Our first task is to create the registration form in the frontend.

There are various ways to implement such forms in the frontend. Let's look at some of the possibilities as described in the following section:

  • Shortcode implementation
  • Page template implementation
  • Custom template implementation

Now, let's look at the implementation of each of these techniques.

Shortcode implementation

Shortcodes are the quickest way to add dynamic content to your pages. In this situation, we need to create a page for registration. Therefore, we need to create a shortcode that generates the registration form, as shown in the following code:

add_shortcode( "register_form", "display_register_form&quot...

Introduction to user management

Usually, popular PHP development frameworks such as Zend, CakePHP, CodeIgniter, and Laravel don't provide a built-in user module. Developers tend to build their own user management modules and use it across many projects of the same framework. WordPress offers a built-in user management system to cater to common user management tasks found in web applications. Such things include the following:

  • Managing user roles and capabilities

  • A built-in user registration functionality

  • A built-in user login functionality

  • A built-in forgot password functionality

Developers are likely to encounter these tasks in almost all web applications. In most cases, these features and functions can be effectively used without significant changes in the code. However, web applications are much more advanced and hence, we might need various customizations on these existing features. It's important to explore the possibility of extending these functions in order to be compatible with advanced...

Getting started with user roles

In simple terms, user roles define the types of users in a system. WordPress offers built-in functions for working with every aspect of user roles. In this section, we will look at how we can manage these tasks by implementing the user roles for our application. We can create a new user role by calling the add_role function. The following code illustrates the basic form of user role creation:

$result = add_role( 'role_name', 'Display Name', array( 'read' => true, 'edit_posts' => true, 'delete_posts' => false ) );

The first parameter takes the role name, which is a unique key to identify the role. The second parameter will be the display name, which will be shown in the admin area. The final parameter will take the necessary capabilities of the user role. You can find out more about existing user roles at http://codex.wordpress.org/Roles_and_Capabilities. In this scenario, read, edit_posts, and delete_posts will be the capabilities while true and false...

Understanding user capabilities

Capabilities can be considered as tasks, which users are permitted to perform inside the application. A single user role can perform many capabilities, while a single capability can be performed by many user roles. Typically, we use the term access control for handling capabilities in web applications. Let's see how capabilities work inside WordPress.

Creating your first capability

Capabilities are always associated with user roles and hence, we cannot create new capabilities without providing a user role. Let's look at the following code for associating custom capability with a follower user role, created in the earlier section, Creating application user roles:

public function add_application_user_capabilities(){
  $role = get_role( 'follower' );
  $role->add_cap( 'follow_developer_activities' );
}

First, we need to retrieve the user role as an object using the get_role function. Then, we can associate new or existing capability using the add_cap function...

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Description

This book is intended for WordPress developers and designers who want to develop quality web applications within a limited time frame and for maximum profit. Prior knowledge of basic web development and design is assumed.

Who is this book for?

This book is intended for WordPress developers and designers who want to develop quality web applications within a limited time frame and for maximum profit. Prior knowledge of basic web development and design is assumed.

What you will learn

  • Develop extendable plugins with the use of WordPress features in core modules
  • Develop pluggable modules to extend the core features of WordPress as independent modules
  • Follow WordPress coding standards to develop reusable and maintainable code
  • Build and customize themes beyond conventional web layouts
  • Explore the power of core database tables and understand the limitations when designing database tables for large applications
  • Integrate open source modules into WordPress applications to keep up with the latest open source technologies
  • Customize the WordPress admin section and themes to create the look and feel of a typical web application

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : May 28, 2015
Length: 404 pages
Edition : 1st
Language : English
ISBN-13 : 9781783988563
Category :
Web Development
Languages :
PHP
Concepts :
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Tools :
WordPress

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Publication date : May 28, 2015
Length: 404 pages
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Language : English
ISBN-13 : 9781783988563
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Web Development
Languages :
PHP
Concepts :
CMS
Tools :
WordPress

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Table of Contents

13 Chapters
1. WordPress as a Web Application Framework Chevron down icon Chevron up icon
1. WordPress as a Web Application Framework
WordPress as a CMS
WordPress as a web application framework
Simplifying development with built-in features
Identifying the components of WordPress
A development plan for the portfolio management application
Understanding limitations and sticking to guidelines
Building a question-answer interface
Enhancing features of the questions plugin
Summary
2. Implementing Membership Roles, Permissions, and Features Chevron down icon Chevron up icon
2. Implementing Membership Roles, Permissions, and Features
Introduction to user management
Getting started with user roles
Understanding user capabilities
Registering application users
Implementing frontend registration
Creating a login form in the frontend
Time to practice
Summary
3. Planning and Customizing the Core Database Chevron down icon Chevron up icon
3. Planning and Customizing the Core Database
Understanding the WordPress database
Exploring the role of existing tables
Adapting existing tables into web applications
Extending the database with custom tables
Planning the portfolio application tables
Querying the database
Limitations and considerations
Summary
4. Building Blocks of Web Applications Chevron down icon Chevron up icon
4. Building Blocks of Web Applications
Introduction to custom content types
Planning custom post types for application
Implementing custom post types for a portfolio application
What is a template engine?
Persisting custom field data
Introducing custom post type relationships
Pods framework for custom content types
Time to practice
Summary
5. Developing Pluggable Modules Chevron down icon Chevron up icon
5. Developing Pluggable Modules
A brief introduction to WordPress plugins
WordPress plugins for web development
Time to practice
Summary
6. Customizing the Dashboard for Powerful Backends Chevron down icon Chevron up icon
6. Customizing the Dashboard for Powerful Backends
Understanding the admin dashboard
Customizing the admin toolbar
Customizing the main navigation menu
Adding features with custom pages
Building options pages
Using feature-packed admin list tables
An awesome visual presentation for admin screens
The responsive nature of the admin dashboard
Time for action
Summary
7. Adjusting Theme for Amazing Frontends Chevron down icon Chevron up icon
7. Adjusting Theme for Amazing Frontends
An introduction to the WordPress application frontend
Web application layout creation techniques
Building the portfolio application home page
Widgetizing application layouts
Designing a home page template
Generating the application frontend menu
Managing options and widgets with customizer
Creating pluggable templates
Extending the home page template with action hooks
Planning action hooks for layouts
Time for action
Summary
8. Enhancing the Power of Open Source Libraries and Plugins Chevron down icon Chevron up icon
8. Enhancing the Power of Open Source Libraries and Plugins
Why choose open source libraries?
Open source libraries inside the WordPress core
Open source JavaScript libraries in the WordPress core
Using PHPMailer for custom e-mail sending
Implementing user authentication with OpenAuth
Using third- party libraries and plugins
Time for action
Summary
9. Listening to Third-party Applications Chevron down icon Chevron up icon
9. Listening to Third-party Applications
Introduction to APIs
The WordPress XML-RPC API for web applications
Building the API client
Creating a custom API
Integrating API user authentication
Integrating API access tokens
Providing the API documentation
Time for action
Summary
10. Integrating and Finalizing the Portfolio Management Application Chevron down icon Chevron up icon
10. Integrating and Finalizing the Portfolio Management Application
Integrating and structuring the portfolio application
Adding the template loader dependencies
Interating the template loader into a user manager
Working with a restructured application
Updating a user profile with additional fields
Scheduling subscriber notifications
Time for action
Final thoughts
Summary
11. Supplementary Modules for Web Development Chevron down icon Chevron up icon
11. Supplementary Modules for Web Development
Internationalization
Working with media grid and image editor
Introduction to the post editor
Lesser-known WordPress features
Introduction to multisite
Time for action
Summary
A. Configurations, Tools, and Resources Chevron down icon Chevron up icon
A. Configurations, Tools, and Resources
Configure and set up WordPress
Open source libraries and plugins
Online resources and tutorials
Index Chevron down icon Chevron up icon
Index

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Rating distribution
Full star icon Full star icon Full star icon Full star icon Full star icon 5
(2 Ratings)
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4 star 0%
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1 star 0%
D. Stevenson Aug 08, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book is awesome. It walks through building a web application on top of WordPress. I tried a few other books that I thought covered the same topic. This one was by far the best I have read on using WordPress as a web application. I actually came back to Amazon to order the print version because I want a paper copy for reference (I previously bought the kindle version).
Amazon Verified review Amazon
ab85 Aug 12, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book covers web app development using WordPress, anything from theme structure to advanced custom post types to working with APIs on the front end. The book shows that WordPress is way more than simple blogging platform or CMS, it can be used as a backend or platform to build web applications.
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About the author

Profile icon Ratnayake
Ratnayake
Rakhitha Nimesh Ratnayake is a freelance web developer, writer, and open source enthusiast. He has over 9 years of experience in developing WordPress applications and plugins. He develops premium WordPress plugins for individual clients and the CodeCanyon marketplace. User Profiles Made Easy and WP Private Content Pro are the most popular plugins developed by him. Building Impressive Presentations with impress.js was his first book, which was published by Packt Publishing. He is also the author of the first three editions of WordPress Web Application Development. In his spare time, he likes to read books and spend time with his family
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Packt eBooks are a complete electronic version of the print edition, available in PDF and ePub formats. Every piece of content down to the page numbering is the same. Because we save the costs of printing and shipping the book to you, we are able to offer eBooks at a lower cost than print editions.

When you have purchased an eBook, simply login to your account and click on the link in Your Download Area. We recommend you saving the file to your hard drive before opening it.

For optimal viewing of our eBooks, we recommend you download and install the free Adobe Reader version 9.