I am trying to turn flat mysql rows into a tree structure.
$categories = array(
array(
'id' => '1',
'name' => 'root',
'parent' => '0',
),
array(
'id' => '2',
'name' => 'first',
'parent' => '1',
),
array(
'id' => '3',
'name' => 'first',
'parent' => '1',
),
array(
'id' => '4',
'name' => 'second',
'parent' => '3',
),
);
I am initializing all the first level nodes first then calling build_tree on each node.
$hierarchy = array();
// loop through and get each root node
foreach($categories as $key => $category) {
if ($category['parent'] == 0) {
// initialize this root
$hierarchy[$category['id']] = $category;
$hierarchy[$category['id']]['children'] = array();
// remove this from categories
unset($categories[$key]);
$this->build_tree($hierarchy[$category['id']], $categories);
}
}
return $hierarchy;
}
function build_tree(&$node, &$categories) {
foreach ($categories as $key => $category) {
// check if this node is the parent
if ($node['id'] === $category['parent']) {
$node['children'][$category['id']] = $category;
$node['children'][$category['id']]['children'] = array();
unset($categories[$key]);
$this->build_tree($category, $categories);
}
}
}
THis is only returning the first and second levels of the tree.
array
1 =>
array
'id' => string '1' (length=1)
'name' => string 'root' (length=4)
'parent' => string '0' (length=1)
'children' =>
array
2 =>
array
'id' => string '2' (length=1)
'name' => string 'first' (length=5)
'parent' => string '1' (length=1)
'children' =>
array
empty
3 =>
array
'id' => string '3' (length=1)
'name' => string 'first' (length=5)
'parent' => string '1' (length=1)
'children' =>
array
empty
Inside of build_tree when it reaches id=2 it is creating children successfully. (finding that there is one child of id=2 and appending it to 'children' correctly)
It is just not saving it! Can anyone see what I am doing wrong?? When I var_dump hierarchy it is just the first and second level never the third even though the third is being created successfully in build_tree. Any help would be very greatly appreciated. Ty.
