如何使用PHP中的数组从数据库中基于n级生成带有父子的图形树？

Question

I have following kind of data to table:

id parent_id child_id level
1 53987 52548 1
2 60764 52548 2
3 60764 53987 1
4 60764 59695 2
5 63457 59695 1
6 60764 63457 1

So, how i can get data by recursively with level and store data to array like ['child_id','parent_id',level]. I need help for writting query and generate the tree.

The tree should be like :

Note: I can't change the database's table structure. I must need tree based on given table structure.

Answer 1

Try This Query:

select  id,
        `child_id`,
        `parent_id` , level
from    (select * from vtiger_ib_level
         order by parent_id, id) products_sorted,
        (select @pv := '60764') initialisation
where   find_in_set(`parent_id`, @pv)
and     length(@pv := concat(@pv, ',', id))