February 12, 2011 
Definition:
function get_category_parents( $id, $link = false, $separator = '/', $nicename = false, $visited = array() {}
Retrieve category parents with separator.
Parameters
- int $id: Category ID.
- bool $link: Optional, default is false. Whether to format with link.
- string $separator: Optional, default is ‘/’. How to separate categories.
- bool $nicename: Optional, default is false. Whether to use nice name for display.
- array $visited: Optional. Already linked to categories to prevent duplicates.
Source code
function get_category_parents( $id, $link = false, $separator = '/', $nicename = false, $visited = array() ) {
$chain = '';
$parent = &get_category( $id );
if ( is_wp_error( $parent ) )
return $parent;
if ( $nicename )
$name = $parent->slug;
else
$name = $parent->name;
if ( $parent->parent && ( $parent->parent != $parent->term_id ) && !in_array( $parent->parent, $visited ) ) {
$visited[] = $parent->parent;
$chain .= get_category_parents( $parent->parent, $link, $separator, $nicename, $visited );
}
if ( $link )
$chain .= '<a href="' . get_category_link( $parent->term_id ) . '" title="' . esc_attr( sprintf( __( "View all posts in %s" ), $parent->name ) ) . '">'.$name.'</a>' . $separator;
else
$chain .= $name.$separator;
return $chain;
}
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