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    <p>You can use a non recursive mysql stored procedure which you can call from your php as follows:</p> <p><strong>Example calls</strong></p> <pre><code>$result = $conn-&gt;query(sprintf("call category_hier(%d)", $catID)); mysql&gt; call category_hier(1); +--------+---------------+---------------+----------------------+-------+ | cat_id | category_name | parent_cat_id | parent_category_name | depth | +--------+---------------+---------------+----------------------+-------+ | 1 | Location | NULL | NULL | 0 | | 3 | USA | 1 | Location | 1 | | 5 | Chicago | 3 | USA | 2 | | 4 | Illinois | 3 | USA | 2 | +--------+---------------+---------------+----------------------+-------+ 4 rows in set (0.00 sec) mysql&gt; call category_hier(2); +--------+---------------+---------------+----------------------+-------+ | cat_id | category_name | parent_cat_id | parent_category_name | depth | +--------+---------------+---------------+----------------------+-------+ | 2 | Color | NULL | NULL | 0 | | 6 | Black | 2 | Color | 1 | | 7 | Red | 2 | Color | 1 | +--------+---------------+---------------+----------------------+-------+ 3 rows in set (0.00 sec) </code></pre> <p><strong>Full script and test data below</strong></p> <pre><code>drop table if exists categories; create table categories ( cat_id smallint unsigned not null auto_increment primary key, name varchar(255) not null, parent_cat_id smallint unsigned null, key (parent_cat_id) ) engine = innodb; insert into categories (name, parent_cat_id) values ('Location',null), ('Color',null), ('USA',1), ('Illinois',3), ('Chicago',3), ('Black',2), ('Red',2); drop procedure if exists category_hier; delimiter # create procedure category_hier ( in p_cat_id smallint unsigned ) begin declare v_done tinyint unsigned default 0; declare v_depth smallint unsigned default 0; create temporary table hier( parent_cat_id smallint unsigned, cat_id smallint unsigned, depth smallint unsigned default 0 )engine = memory; insert into hier select parent_cat_id, cat_id, v_depth from categories where cat_id = p_cat_id; create temporary table tmp engine=memory select * from hier; /* http://dev.mysql.com/doc/refman/5.0/en/temporary-table-problems.html */ while not v_done do if exists( select 1 from categories c inner join tmp on c.parent_cat_id = tmp.cat_id and tmp.depth = v_depth) then insert into hier select c.parent_cat_id, c.cat_id, v_depth + 1 from categories c inner join tmp on c.parent_cat_id = tmp.cat_id and tmp.depth = v_depth; set v_depth = v_depth + 1; truncate table tmp; insert into tmp select * from hier where depth = v_depth; else set v_done = 1; end if; end while; select c.cat_id, c.name as category_name, p.cat_id as parent_cat_id, p.name as parent_category_name, hier.depth from hier inner join categories c on hier.cat_id = c.cat_id left outer join categories p on hier.parent_cat_id = p.cat_id order by hier.depth; drop temporary table if exists hier; drop temporary table if exists tmp; end # delimiter ; call category_hier(1); call category_hier(2); </code></pre> <p>Hope this helps :)</p>
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