wp tax_query in with code examples

Introduction

In WordPress, the tax_query argument is an essential part of making complex taxonomy-based queries. The tax_query argument allows you to query multiple taxonomies and terms at once, making it a powerful tool for creating custom post type archives, category archives, and more. In this article, we’ll go over how to use the tax_query argument in your WordPress queries and provide some code examples to help you get started.

What is a Taxonomy in WordPress?

A taxonomy in WordPress is a way to group and categorize content. By default, WordPress has two taxonomies: categories and tags. You can also create your own custom taxonomies, which can be used to organize your content in a way that makes sense for your website.

How to Use the tax_query Argument

The tax_query argument is an array of arrays, where each array represents a single taxonomy query. The first array in the tax_query argument is used to define the taxonomy you want to query, while the second array is used to define the terms you want to include or exclude.

Here’s an example of how to use the tax_query argument to query posts in the “category” taxonomy with the term “news”:

$args = array(
	'post_type' => 'post',
	'tax_query' => array(
		array(
			'taxonomy' => 'category',
			'field' => 'slug',
			'terms' => 'news',
		),
	),
);
$query = new WP_Query( $args );

In this example, we’re using the taxonomy argument to define the taxonomy we want to query, which is the “category” taxonomy. We’re also using the field argument to specify that we want to query by the term slug, and the terms argument to specify the term we want to include, which is “news”.

Code Examples

Here are some code examples to help you get started with using the tax_query argument in your WordPress queries:

  1. Query posts in multiple taxonomies
$args = array(
	'post_type' => 'post',
	'tax_query' => array(
		'relation' => 'AND',
		array(
			'taxonomy' => 'category',
			'field' => 'slug',
			'terms' => 'news',
		),
		array(
			'taxonomy' => 'post_tag',
			'field' => 'slug',
			'terms' => 'featured',
		),
	),
);
$query = new WP_Query( $args );

In this example, we’re using the relation argument to specify that we want to query posts that belong to both the “news” category and have the “featured” tag.

  1. Exclude posts in a taxonomy
$args = array(
	'post_type' => 'post',
	'tax_query' => array(
		array(
			'taxonomy' => 'category',

Operators in the `tax_query` Argument

The `tax_query` argument allows you to specify the operator you want to use when querying terms. The available operators are `IN`, `NOT IN`, `AND`, and `EXISTS` (or `NOT EXISTS`).

The `IN` operator returns posts that have any of the specified terms. The `NOT IN` operator returns posts that do not have any of the specified terms. The `AND` operator returns posts that have all of the specified terms. The `EXISTS` operator returns posts that have any of the specified terms, while the `NOT EXISTS` operator returns posts that do not have any of the specified terms.

Here’s an example of how to use the `IN` operator to query posts that have either the “news” category or the “featured” tag:

$args = array(
'post_type' => 'post',
'tax_query' => array(
'relation' => 'OR',
array(
'taxonomy' => 'category',
'field' => 'slug',
'terms' => 'news',
'operator' => 'IN',
),
array(
'taxonomy' => 'post_tag',
'field' => 'slug',
'terms' => 'featured',
'operator' => 'IN',
),
),
);
$query = new WP_Query( $args );

In this example, we’re using the `relation` argument to specify that we want to query posts that belong to either the “news” category or have the “featured” tag. We’re also using the `operator` argument to specify that we want to use the `IN` operator.

Nested Taxonomy Queries

The `tax_query` argument also supports nested taxonomy queries. This means you can create a query that returns posts that have terms from multiple taxonomies and multiple terms within each taxonomy.

Here’s an example of how to create a nested taxonomy query:

$args = array(
'post_type' => 'post',
'tax_query' => array(
'relation' => 'AND',
array(
'taxonomy' => 'category',
'field' => 'slug',
'terms' => array( 'news', 'featured' ),
'operator' => 'IN',
),
array(
'taxonomy' => 'post_tag',
'field' => 'slug',
'terms' => array( 'sports', 'entertainment' ),
'operator' => 'IN',
),
),
);
$query = new WP_Query( $args );

In this example, we’re using the `relation` argument to specify that we want to query posts that belong to both the “news” or “featured” categories and have either the “sports” or “entertainment” tags.

Conclusion

The `tax_query`
## Popular questions 
1. What is the `tax_query` argument in WordPress?

The `tax_query` argument is used to query posts based on their terms (categories, tags, etc.) in WordPress. It allows you to specify the terms you want to include or exclude from your query.

2. What are the available operators in the `tax_query` argument?

The available operators in the `tax_query` argument are `IN`, `NOT IN`, `AND`, and `EXISTS` (or `NOT EXISTS`). These operators determine how the terms in your query are related. For example, you can use the `IN` operator to return posts that have any of the specified terms, or the `AND` operator to return posts that have all of the specified terms.

3. How do you create a simple taxonomy query in WordPress?

Here is an example of a simple taxonomy query in WordPress using the `tax_query` argument:

$args = array(
'post_type' => 'post',
'tax_query' => array(
array(
'taxonomy' => 'category',
'field' => 'slug',
'terms' => 'news',
'operator' => 'IN',
),
),
);
$query = new WP_Query( $args );

In this example, we are querying posts that belong to the `category` taxonomy and have the `news` term.

4. Can you create nested taxonomy queries in WordPress?

Yes, it is possible to create nested taxonomy queries in WordPress. This means you can query posts that have terms from multiple taxonomies and multiple terms within each taxonomy.

Here is an example of a nested taxonomy query:

$args = array(
'post_type' => 'post',
'tax_query' => array(
'relation' => 'AND',
array(
'taxonomy' => 'category',
'field' => 'slug',
'terms' => array( 'news', 'featured' ),
'operator' => 'IN',
),
array(
'taxonomy' => 'post_tag',
'field' => 'slug',
'terms' => array( 'sports', 'entertainment' ),
'operator' => 'IN',
),
),
);
$query = new WP_Query( $args );

In this example, we are querying posts that belong to both the `news` or `featured` categories and have either the `sports` or `entertainment` tags.

5. How do you specify the operator you want to use when querying terms in the `tax_query` argument?

The operator is specified using the `operator` argument within the `tax_query` argument. For example, to use the `IN` operator, you would include the following:

'operator' => 'IN',

You can use any of the available operators, such as `NOT IN`, `AND`, and `EXISTS` (or `NOT EXISTS`).
### Tag 
WordPress
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