Get Children IDs of a Parent Taxonomy Category in WordPress

In WordPress, you can get the children IDs of a parent taxonomy category using the 'get_term_children()' function. Here's an example of how you can achieve this:

$parent_category_id = 10; // replace with the actual ID of the parent category

$child_ids = get_term_children( $parent_category_id, 'category' ); // replace 'category' with your taxonomy name

// Loop through the child IDs
foreach ( $child_ids as $child_id ) {
    echo $child_id . '<br>';
}

In the code above, we first set the '$parent_category_id' variable to the ID of the parent category whose children we want to retrieve.

Then, we use the 'get_term_children()' function passing the '$parent_category_id' and the taxonomy name as parameters. This function returns an array of IDs for the children of the specified parent category.

Finally, we loop through the child IDs using a 'foreach' loop and echo each ID.

Note: Make sure to replace 'category' with the actual name of your taxonomy.