mysql query child parent relation - php

Question

I have a query
SELECT bs.i_description,col.Column_name,bs.Tm_id,ad.UserName as name,
a.fk_sprint_id as spid,b.fk_back_id,b.u_pos_is,b.s_id,b.color,b._left,b._top,
b.wiptime as wiptime,b.dodtime as dodtime,b.Dep_status
FROM backToSprint a
JOIN backToSprint b ON a.`s_id` = b.`fk_f_id`
join backlog bs on bs.b_id=b.fk_back_id
left join admin ad on bs.Tm_id=ad.adminID
left join admin_column col on col.column_id=b.u_pos_is
where a.fk_sprint_id=3 and a.teamid=1
ORDER BY a.`fk_f_id`
Where I got output like
Array
(
[0] => Array
(
[i_description] => Story 1
[Column_name] => Backlogs
[Tm_id] => 0
[name] =>
[spid] => 3
[fk_back_id] => 408
[u_pos_is] => 1
[s_id] => 5
[color] => 2
[_left] => 18
[_top] => -9
[wiptime] =>
[dodtime] =>
[Dep_status] => 0
)
[1] => Array
(
[i_description] => Story 2
[Column_name] => Backlogs
[Tm_id] => 0
[name] =>
[spid] => 3
[fk_back_id] => 409
[u_pos_is] => 1
[s_id] => 6
[color] => 3
[_left] => 18
[_top] => -9
[wiptime] =>
[dodtime] =>
[Dep_status] => 0
)
)
Here Column name is same so I expect output like
Array
(
['c'] => Array
(
[Column_name] => Backlogs
)
[0] => Array
(
[i_description] => Story 1
[Column_name] => Backlogs
[Tm_id] => 0
[name] =>
[spid] => 3
[fk_back_id] => 408
[u_pos_is] => 1
[s_id] => 5
[color] => 2
[_left] => 18
[_top] => -9
[wiptime] =>
[dodtime] =>
[Dep_status] => 0
)
[1] => Array
(
[i_description] => Story 2
[Column_name] => Backlogs
[Tm_id] => 0
[name] =>
[spid] => 3
[fk_back_id] => 409
[u_pos_is] => 1
[s_id] => 6
[color] => 3
[_left] => 18
[_top] => -9
[wiptime] =>
[dodtime] =>
[Dep_status] => 0
)
)
Then i tried
$this->view->getstories['c'] = ['Column_name' => array_unique(array_column( $this->view->getstories, 'Column_name'))];
which didn't get actual output.i got output like
Array
(
[0] => Array
(
[i_description] => Story 1
[Column_name] => Backlogs
[Tm_id] => 0
[name] =>
[spid] => 3
[fk_back_id] => 408
[u_pos_is] => 1
[s_id] => 5
[color] => 2
[_left] => 18
[_top] => -9
[wiptime] =>
[dodtime] =>
[Dep_status] => 0
)
[1] => Array
(
[i_description] => Story 2
[Column_name] => WIP
[Tm_id] => 0
[name] =>
[spid] => 3
[fk_back_id] => 409
[u_pos_is] => 2
[s_id] => 6
[color] => 3
[_left] => 18
[_top] => -9
[wiptime] =>
[dodtime] =>
[Dep_status] => 0
)
[c] => Array
(
[Column_name] => Array
(
[0] => Backlogs
[1] => WIP
)
)
)
(Here i have another column name WIP)
But i want a nested array like
Array
(
[c1] => Array
(
[Column_name] => Array
(
[0] => Backlogs
)
[0] => Array
(
[i_description] => Story 1
[Column_name] => Backlogs
[Tm_id] => 0
[name] =>
[spid] => 3
[fk_back_id] => 408
[u_pos_is] => 1
[s_id] => 5
[color] => 2
[_left] => 18
[_top] => -9
[wiptime] =>
[dodtime] =>
[Dep_status] => 0
)
[c2] => Array
(
[Column_name] => Array
(
[0] => WIP
)
[0] => Array
(
[i_description] => Story 2
[Column_name] => WIP
[Tm_id] => 0
[name] =>
[spid] => 3
[fk_back_id] => 409
[u_pos_is] => 2
[s_id] => 6
[color] => 3
[_left] => 18
[_top] => -9
[wiptime] =>
[dodtime] =>
[Dep_status] => 0
)
)
)
Please help me to solve this issue
Any help would be appreciated.

Answer 1

What you want is nested arrays. Do it while fetching the rows from the query, using $row['Column_name'] as the key of the main array, and pushing each row onto that nested array.
$results = [];
while ($row = $stmt->fetch()) {
$results[$row['Column_name']][] = $row;
}
This will create a result like:
Array
(
[Backlogs] => Array
(
[0] => Array
(
[i_description] => Story 1
[Column_name] => Backlogs
[Tm_id] => 0
[name] =>
[spid] => 3
[fk_back_id] => 408
[u_pos_is] => 1
[s_id] => 5
[color] => 2
[_left] => 18
[_top] => -9
[wiptime] =>
[dodtime] =>
[Dep_status] => 0
)
)
[WIP] => Array
(
[0] => Array
(
[i_description] => Story 2
[Column_name] => WIP
[Tm_id] => 0
[name] =>
[spid] => 3
[fk_back_id] => 409
[u_pos_is] => 2
[s_id] => 6
[color] => 3
[_left] => 18
[_top] => -9
[wiptime] =>
[dodtime] =>
[Dep_status] => 0
)
)
)
)
There's no need for the c1 and c2 keys, just use the Column_name values as the keys of the main array.