February 12, 2011 
Definition:
function get_category_children( $id, $before = '/', $after = '', $visited = array() {}
Retrieve category children list separated before and after the term IDs.
Parameters
- int $id: Category ID to retrieve children.
- string $before: Optional. Prepend before category term ID.
- string $after: Optional, default is empty string. Append after category term ID.
- array $visited: Optional. Category Term IDs that have already been added.
Source code
function get_category_children( $id, $before = '/', $after = '', $visited = array() ) {
_deprecated_function( __FUNCTION__, '2.8', 'get_term_children()' );
if ( 0 == $id )
return '';
$chain = '';
/** TODO: consult hierarchy */
$cat_ids = get_all_category_ids();
foreach ( (array) $cat_ids as $cat_id ) {
if ( $cat_id == $id )
continue;
$category = get_category( $cat_id );
if ( is_wp_error( $category ) )
return $category;
if ( $category->parent == $id && !in_array( $category->term_id, $visited ) ) {
$visited[] = $category->term_id;
$chain .= $before.$category->term_id.$after;
$chain .= get_category_children( $category->term_id, $before, $after );
}
}
return $chain;
}
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