Categories_library::get_child_ids PHP Method

    public function get_child_ids($parent = 0)
    {
        // First we get all the categories and store it.
        if (empty($this->_all_cats)) {
            $this->_ci->db->select('cat_id,cat_parent')->from('categories')->where('cat_display', 'yes');
            $query = $this->_ci->db->get();
            if ($query->num_rows() == 0) {
                return FALSE;
            }
            $this->_all_cats = $query->result_array();
        }
        foreach ($this->_all_cats as $row) {
            // This assigns all the fields to the array.
            foreach ($row as $key => $val) {
                $arr[$key] = $val;
            }
            $menu_array[$row['cat_id']] = $arr;
        }
        unset($arr);
        foreach ($menu_array as $key => $val) {
            // Now add any children.
            if ($parent == $val['cat_parent'] or $parent == $val['cat_id']) {
                $depth = 0;
                if (!in_array($val['cat_id'], $this->_cat_ids, TRUE)) {
                    $this->_cat_ids = array_merge(array($val['cat_id']), $this->_cat_ids);
                    $this->_child_subtree($key, $menu_array, $depth);
                }
            }
        }
    }