Get all child terms of parent taxonomy term in WordPress

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Post summary: I have my taxonomy with multiple levels. Here is an example: ProductsJackpotsSlotsTablesCompanyleadershipnewsalerts Sometimes, you want to display only child terms of parent taxonomy. In this case, I need to display all child terms of products term. What do I need to prepare? I need taxonomy ID from WordPress admin, and prepare a query. Here is…

I have my taxonomy with multiple levels. Here is an example:

• Products
  • Jackpots
  • Slots
  • Tables
• Company
  • leadership
  • news
  • alerts

Sometimes, you want to display only child terms of parent taxonomy. In this case, I need to display all child terms of products term. What do I need to prepare? I need taxonomy ID from WordPress admin, and prepare a query.

Here is the list of avaialble query args:

$defaults = array(
        'child_of'            => 0,
        'current_category'    => 0,
        'depth'               => 0,
        'echo'                => 1,
        'exclude'             => '',
        'exclude_tree'        => '',
        'feed'                => '',
        'feed_image'          => '',
        'feed_type'           => '',
        'hide_empty'          => 1,
        'hide_title_if_empty' => false,
        'hierarchical'        => true,
        'order'               => 'ASC',
        'orderby'             => 'name',
        'separator'           => '<br />',
        'show_count'          => 0,
        'show_option_all'     => '',
        'show_option_none'    => __( 'No categories' ),
        'style'               => 'list',
        'taxonomy'            => 'category',
        'title_li'            => __( 'Categories' ),
        'use_desc_for_title'  => 1,
    );

If you need to know more, follow official WordPress documentation: wp_list_categories() | Function | WordPress Developer Resources.

So in case you need only child terms, you need to use query like this:

<?php
$categories = get_categories( array(
    'orderby' => 'name',
    'order'   => 'ASC',
    'child_of'            => 11, //set your category ID
    'hide_empty'          => 0,
    'hide_title_if_empty' => false,
    'order'               => 'ASC',
    'orderby'             => 'name',
) );

foreach( $categories as $category ) {	
 echo '<a href="' . get_category_link($category->term_id) . '">' . $category->name . '</a>';   
} 
?>

You can also use the wp_list_categories() function, but I prefer get_categories for more customizable output.

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