Custom taxonomy in wordpress from a to z and get them to front end

Hi guys! Continuing with the topic of wordpress theme programming , today I will show you how to custom taxonomy in wordpress.

So what is a taxonomy? Is it important or not? Why do we need to go find it? … All I will clarify in this post.

What is custom taxonomy in wordpress?

By default, when installing wordpress, in the post section (Articles) we will see 2 sections: Categories and tags . These 2 sections in wordpress are called taxonomy (Category taxonomy).

Creating a new category taxonomy with a structure similar to a category or tag is called a custom taxonomy in wordpress.

For example: We have a custom post type that is a product, now want to divide the product by category, by default wordpress does not provide it. We have to create a custom taxonomy “category” to make the product category…

Create custom taxonomy in wordpress

To create a custom taxonomy, insert the following code into the functions.php file of the theme you are using.

Well, I will create a custom taxomony as the location in the post .

Syntax

function location_custom_taxonomy() {
    $labels = array(
        'name' => 'Địa điểm',
        'singular' => 'Địa điểm',
        'menu_name' => 'Địa điểm'
    );
    $args = array(
        'labels'                     => $labels,
        'hierarchical'               => true,
        'public'                     => true,
        'show_ui'                    => true,
        'show_admin_column'          => true,
        'show_in_nav_menus'          => true,
        'show_tagcloud'              => true,
    );
    register_taxonomy('dia-diem', 'post', $args);
}
add_action( 'init', 'location_custom_taxonomy', 0 );
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Attention

• The hierarchical parameter can take 2 values, if true , the function is similar to the category , and false , the function is similar to the tag .
• The register_taxonomy function takes 3 parameters
  • ‘dia-diem’ This is the taxonomy’s slug that will later be used to get data. Name as you like, write immediately without accents
  • ‘post’ this is the post type that displays this taxonomy. For example, if you want to create a taxonomy for a product, this place must be ‘san-pham’
  • $args is the parameter declared above

Create custom taxonomy with plugin

In addition to creating a taxonomy with the code above, there are also many plugins that support this. I also had an article about creating custom taxonomy with the toolset types plugin you can refer to. Or check out some of the following free plugins

• Pods – Custom Content Types and Fields
• Custom Post Type UI
• MB Custom Taxonomy

Get custom taxonomy in wordpress

Get a list of custom taxonomy

Similar to get category in wordpress , we use the following code to insert it into the position to display in the theme

<?php $args = array( 
    'hide_empty' => 0,
    'taxonomy' =&gt; 'danh-muc',
    ); 
    $cates = get_categories( $args ); 
    foreach ( $cates as $cate ) {  ?&gt;
		

Note: The parameter taoxonomy receives the value of the slug of the taxonomy that we declare when creating it.

Get post with custom taxonomy in wordpress

To get a list of articles belonging to a certain taxonomy, by default we will name the file: taxonomy-{slug}.php as in the example above, we will name the file taxonomy-dia-diem.php

For new wp_query we will have the following get post code:

<?php $args = array(
    'posts_per_page' => -1,
    'post_type'      =&gt; 'post',
    'dia-diem'       =&gt; 'slug'
  );
  $the_query = new WP_Query( $args );
?&gt;
<?php if( $the_query->have_posts() ): ?&gt;
<?php while( $the_query->have_posts() ) : $the_query-&gt;the_post(); ?&gt;
  // Thông tin cần lấy của 1 bài viết
<?php endwhile; ?><?php endif; ?><?php wp_reset_query(); ?><div>
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Note: the slug in the above parameter is the taxonomy’s slug to get.

summary

So today I showed you how to custom taxonomy in wordpress. This is also one of the very important knowledge. Make our website more professional.

I will continue to update the latest articles in this topic. Please keep an eye on it!

Thank you and hello everyone.