Posted by uidzer0 on 10/19/07 19:06

Hey everyone,

I'm having a little trouble writing an algorithm to create a
hierarchal structure from a database which looks like this:

Code:

parent_id | child_id |
----------------+-------------+
1 | 2 |
2 | 3 |
3 | 4 |
3 | 5 |
5 | 6 |
5 | 7 |


So coming out of the database, I get an array which looks like this:

Code:

Array
(
[0] => Array
(
[parent_id] => 1
[child_id] => 2
)

[1] => Array
(
[parent_id] => 2
[child_id] => 3
)

[2] => Array
(
[parent_id] => 3
[child_id] => 4
)
....


I would like to put this into an array which represents the following
structure:

Code:

1
\
2
\
3
/ \
4 5
/ \
6 7


Can anyone point me in the right direction? Let me know if this isn't
clear - I can try to elaborate.

Thanks!

Ben

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