php - How to reorder data in a tree stored using the nested set model? -


i have table following structure

create table `nested_set` (     `id` int(11) unsigned not null auto_increment,     `lft` int(11) not null,     `rgt` int(11) not null,     `id_parent` int(11) null,     `name` varchar(255) null,     primary key (`id`),     key `fk_nested_sets` (`id_parent`) )

i want preserve level structure reorder alphabetically nodes within each node. how can achieve using mysql or (php , mysql)?

(id_parent added model can easy move nodes or down)


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