Algorithm for tree data in php codeigniter - codeigniter

Question

I am having trouble creating a category tree structure in php and codeigniter ramework environments.
So now I want the structure of the data.
Data Example:
{
"category": [
{
"id" : "1",
"text" : "test1"
"children": false,
}, {
"id" : "2",
"text" : "test2",
"children": [
{
"children": false,
"id" : "3",
"text" : "test3"
}, {
"children": false,
"id" : "4",
"text" : "test4"
}, {
"children": false,
"id" : "5",
"text" : "test5"
}, {
"children": false,
"id" : "6",
"text" : "test7"
}
]
}
]
}
I'm having trouble creating an array for each json object's children
The query I am trying:
public function setCategoryTree($categoryUp = null)
{
$param = array();
$query = ' SELECT id, name, categoryUp
FROM categoryTable
WHERE categoryUp = ? ';
return $this->commerce_db->query($query)->result();
}
The controller I'm trying to:
public function getCategoryTree(){
$this->load->model('category_m');
$result = $this->category_m->setCategoryTree();
$resultData = array();
foreach($result as $value) {
$treeTmpData = array();
$treeTmpData['id'] = $value->id;
$treeTmpData['text'] = $value->text;
$treeTmpData['children'] = ????
$resultData[] = $treeTmpData;
}
echo json_encode($resultData, JSON_UNESCAPED_UNICODE);
}
Good luck to me

Answer 1

You can use this code for your purpose. I use recursion for getting childern.
Table structure is :
CREATE TABLE `categorytable` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(50) DEFAULT NULL,
`parent_id` int(11) DEFAULT NULL,
PRIMARY KEY (`id`)
);
Model methods are:
public function setCategoryTree() {
$categories = array();
$query = $this->db->query('SELECT id, name as text, parent_id as children FROM categoryTable WHERE parent_id IS NULL');
foreach ($query->result() as $row) {
$child = $this->getChilderen($row->id);
if (count($child) > 0) {
$row->children = $child;
} else {
$row->children = false;
}
$categories[] = $row;
}
return $categories;
}
private function getChilderen($parentId) {
$child = array();
$query = $this->db->query('SELECT id, name as text, parent_id as children FROM categoryTable WHERE parent_id = ' . $parentId);
if (count($query->result()) > 0) {
foreach ($query->result() as $i => $row) {
if ($row->children > 0) {
$row->children = $this->getChilderen($row->id);
}
$child[$i] = $row;
}
return $child;
} else {
return false;
}
}
Controller code:
public function getCategoryTree(){
$this->load->model('category_m');
$resultData = $this->category_m->setCategoryTree();
echo json_encode($resultData, JSON_UNESCAPED_UNICODE);
}
Hope, that will help you. Let me know if you stuck somewhere.