show hierarchical select in a php function - php

Question

I have an array like below:
$cats = array();
$cats[1] = array('id' => 1,'parent' => 0, 'title' => 'Tutorials');
$cats[2] = array('id' => 2,'parent' => 1, 'title' => 'PHP');
$cats[3] = array('id' => 3,'parent' => 2, 'title' => 'OOP');
$cats[4] = array('id' => 4,'parent' => 2, 'title' => 'Tips');
$cats[5] = array('id' => 5,'parent' => 1, 'title' => 'JavaScript');
$cats[6] = array('id' => 6,'parent' => 5, 'title' => 'Basics');
$cats[7] = array('id' => 7,'parent' => 5, 'title' => 'Frameworks');
$cats[8] = array('id' => 8,'parent' => 7, 'title' => 'jQuery');
$cats[9] = array('id' => 9,'parent' => 7, 'title' => 'MooTools');
$cats[10] = array('id' => 10,'parent' => 0, 'title' => 'News');
$cats[11] = array('id' => 11,'parent' => 10, 'title' => 'PHP');
$cats[12] = array('id' => 12,'parent' => 10, 'title' => 'Wordpress');
$cats[13] = array('id' => 13,'parent' => 0, 'title' => 'New');
and want to show it in a PHP function like this that call an function and give this array,
for example
$id=1;
builder_tree($id);
and give me bellow array ,please help me
Array
(
[0] => Array
(
[id] => 1
[parent] => 0
[title] => Tutorials
[children] => Array
(
[0] => Array
(
[id] => 2
[parent] => 1
[title] => PHP
[children] => Array
(
)
)
[1] => Array
(
[id] => 3
[parent] => 1
[title] => PHP
[children] => Array
(
)
)
[2] => Array
(
[id] => 5
[parent] => 1
[title] => JavaScript
[children] => Array
(
[0] => Array
(
[id] => 6
[parent] => 5
[title] => PHP
[children] => Array
(
)
)
[1] => Array
(
[id] => 7
[parent] => 5
[title] => PHP
[children] => Array
(
[0] => Array
(
[id] => 8
[parent] => 7
[title] => jQuery
[children] => Array
(
)
)
[1] => Array
(
[id] => 9
[parent] => 7
[title] => MooTools
[children] => Array
(
)
)
)
)
)
)
)
)

Answer 1

I realize this is an old question, but I was looking for something similar to what the original poster needed and came up with the following.
Hope this helps any future Googlers.
The build_tree_array() basically takes what the original poster posted above and coverts it to a hierarchical array.
function folder_has_children($rows, $id) {
foreach ($rows as $row) {
if ($row['child_of'] == $id)
return true;
}
return false;
}
function build_tree_array(&$rows, $parent = 0) {
foreach ($rows as $row) {
if ($row['child_of'] == $parent) {
$result = $row;
if ($this->folder_has_children($rows, $row['id'])) {
$result['children'] = $this->build_tree_array($rows, $row['id']);
}
$out[] = $result;
}
}
return $out;
}