<?php 
// require('PHPTree.class.php');

//原始数据, 从数据库读出
$data = array(
	array(
		'id'=>1,
		'name'=>'book',
		'parent_id'=>0
	),
	array(
		'id'=>2,
		'name'=>'music',
		'parent_id'=>0
	),
	array(
		'id'=>3,
		'name'=>'book1',
		'parent_id'=>1
	),
	array(
		'id'=>4,
		'name'=>'book2',
		'parent_id'=>3
	)
);

$r = \king192\phpTree\PHPTree::makeTree($data);
echo json_encode($r);

?>
The Result:
[
        {
            "id": 1,
            "name": "book",
            "parent_id": 0,
            "expanded": false, //不展开子节点
            "children": [
                {
                    "id": 3,
                    "name": "book1",
                    "parent_id": 1,
                    "expanded": false,
                    "children": [
                        {
                            "id": 4,
                            "name": "book2",
                            "parent_id": 3,
                            "leaf": true
                        }
                    ]
                }
            ]
        },
        {
            "id": 2,
            "name": "music",
            "parent_id": 0,
            "leaf": true
        }
]