February 12, 2011 
Definition:
function get_term_children( $term_id, $taxonomy ) {}
Merge all term children into a single array of their IDs.
This recursive function will merge all of the children of $term into the same array of term IDs. Only useful for taxonomies which are hierarchical.
Parameters
- string $term_id: ID of Term to get children
- string $taxonomy: Taxonomy Name
Return values
returns:List of Term Objects. WP_Error returned if $taxonomy does not exist
Source code
function get_term_children( $term_id, $taxonomy ) {
if ( ! taxonomy_exists($taxonomy) )
return new WP_Error('invalid_taxonomy', __('Invalid Taxonomy'));
$term_id = intval( $term_id );
$terms = _get_term_hierarchy($taxonomy);
if ( ! isset($terms[$term_id]) )
return array();
$children = $terms[$term_id];
foreach ( (array) $terms[$term_id] as $child ) {
if ( isset($terms[$child]) )
$children = array_merge($children, get_term_children($child, $taxonomy));
}
return $children;
}
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