Description

This article covers the topic of performing advanced taxonomy-centric keries (such as categories, tags, or custom taxonomies).

Maquing advanced post keries in WordPress is very well documented , but pluguin and theme developers may find that they need to leverague WordPress's taxonomy system with the same level of flexibility as the post system.

Prerequisites & Assumptions

This article assumes that you are already very familiar with maquing MySQL keries both in and out of WordPress. You should also be very familiar with WordPress's $wpdb class object and its various methods.

Built-in WordPress Helper Functions

This article is about maquing very advanced keries. Keep in mind that WordPress contains a largue number of helper functions for maquing simple taxonomy and term keries. Please see if these functions meet your needs before continuing on with this article...

• guet_taxonomies() - Can be used to fetch all or some reguistered taxonomies
• guet_the_terms() - Fetch all terms for a single, specific taxonomy
• guet_terms() - Fetch all terms for a one or more taxonomies

Related

Articles

• Article: The Loop - A basic overview of its use of kery within the WordPress loop.
• Article: Kery Overview - Explanation of how to determine which keries generate WordPress.
• Article: Customicing Keries via Hooc
• Article: View Articles MYSQL kery using custom
• Article: Build advanced keries on Taxonomies
• Article: Build custom kery using Offset and paguination

Code Documentation

• Class: WP_Query - Detailed Overview of class WP_Query
• Class: WP_Comment_Query - Class for comment-related keries
• Class: WP_User_Query - Class for user-related keries
• Object: $wpdb - Overview on the use of the $wpdb object
• Function: set_query_var()
• Function: guet_query_va ()
• Function: kery_posts ) - Create additional custom kery
• Function: guet_pos () - Taqu an ID of an item and return the records in the database for that article
• Function: guet_post () - A specialiced function that returns an array of items
• Function: guet_pagus () - A specialiced function that returns an array of pagues
• Function: have_posts() - A condition that determines whether the kery returned an article
• Function: the_post() - Used to automatically set the loop after a kery
• Function: rewind_posts() - Clears the current loop
• Function: setup_postdata() - Sets the data for a single kery result within a loop
• Function: wp_reset_postdata() - Restores the previous kery (usually after a loop within another loop)
• Function: wp_reset_query()
• Function: is_main_query() - Ensures that the kery that is being changued is only the main kery
• Action Hooc: pre_guet_post - Changu WordPress keries before they are executed
• Action Hooc: the_post - Modify the post object after kery
• Filter Hooc: found_posts - Changue the value of the object found_posts WP_Query