Get recursive depth for every row - php

Question

I have the following db table
82 is the parent of 84. 24 is the parent of 82 and 83. In php I have a method to fetch rows by uid.
public function fetchByUid($uid){
//code
}
This would retrieve the 7th and 6th value from the table. Now I want to fetch not only the rows where uid is equal but also the rows where the parent is the child of uid. E.g. 82 is a parent of 84 but also a child of 24.
So I came up with some recursion.
public function fetchByUidRec($uid, $data, $counter){
//set of rows by uid
$db_resultSet;
foreach($db_resultSet as $row){
$entry = array();
$entry['id'] = $row->id;
$entry['uid'] = $row->uid;
$entry['rid'] = $row->rid;
$entry['layer'] = $counter;
$data [] = $entry;
//now I want to do the same on the child
$data [] = fetchByUidRec($row->rid, $data, $counter = $counter + 1)
}
return $data;
}
public function getchByUid($uid){
$data = array();
$counter = 0;
return fetchByUidRec($uid, $data, $counter)
}
But that does not work at all :( I want to store the current recrusion depth in $data['layer']
Any ideas?

Answer 1

If I understood you correctly:
$rows = array
(
0 => array('id' => 8, 'uid' => 82, 'rid' => 84),
1 => array('id' => 7, 'uid' => 24, 'rid' => 82),
2 => array('id' => 6, 'uid' => 24, 'rid' => 83),
);
function fetchByUidRec($uid, $counter = 0)
{
global $rows;
// or in your case
// $rows = SELECT FROM table WHERE uid = $uid;
$data = array();
foreach ($rows as $row)
{
if ($row['uid'] == $uid)
{
$data[] = array_merge($row, array('layer' => $counter));
$data = array_merge($data, fetchByUidRec($row['rid'], $counter++));
}
}
return $data;
}
Example:
echo '<pre>';
print_r(fetchByUidRec(24));
echo '</pre>';
Output:
Array
(
[0] => Array
(
[id] => 7
[uid] => 24
[rid] => 82
[layer] => 0
)
[1] => Array
(
[id] => 8
[uid] => 82
[rid] => 84
[layer] => 0
)
[2] => Array
(
[id] => 6
[uid] => 24
[rid] => 83
[layer] => 1
)
)