Working with WP_Query: The Complete User’s Guide

Working with WP_Query: The Complete User's Guide | WPShout

This free WPShout Course is a step-by-step introduction to WP_Query, one of the most powerful systems in WordPess. By the end of the course, you’ll know what a WP_Query is, and how and why to use your own custom WP_Querys for theme and plugin development. It really is a revolutionary and powerful tool for every WordPress theme and plugin developer to master ?

One thing before we dive in. If you want access to videos and additional code examples about WP_Query—and if you want to better understand WordPress development in general—have a look at our full “learn WordPress development” course, Up and Running. It’s the best guide to WordPress development out there.

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1. WP_Query: Understanding the Basics of Object-Oriented Programming

The WP_Query API uses a programming style called object-oriented programming, or OOP. Every WP_Query is actually a WP_Query Object, meaning an individual instance of the broader WP_Widget class. If this setup doesn’t make sense to you, you’ll want to quickly learn the basics of object-oriented programming (OOP):

Introduction to Object-Oriented PHP for WordPress Developers

Key Point: Classes and Objects

A class is an abstract description of a type of thing. Once you’ve defined a class in object-oriented code, you create actual objects which contains the traits you defined in the class. The article uses the example of a Chair class:

// Creating the Chair class
class Chair {
    // Here we list important elements that all Chairs have,
    // like "height" and "color"
}

// Creating a Chair object
$mychair = new Chair;

This is the bedrock of what you’ll need to know in OOP to work with WP_Query.

2. The Loop: How WordPress Processes Fetched Post Bundles into Webpages

WP_Query does precisely one thing: it fetches bundles of WordPress posts from the WordPress database. Before you learn WP_Query directly, you’ll

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This article was written by Fred Meyer and originally published on WPShout.

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