我想创建一个递归工作的函数，从具有未知级别和未知元素数的多维数组生成树视图
这是db文件
--
-- Table structure for table `accounts_tree`
--
CREATE TABLE `accounts_tree` (
`id` bigint(20) NOT NULL,
`parent_id` bigint(20) DEFAULT '0',
`final_acc_id` bigint(20) NOT NULL,
`Code` varchar(255) DEFAULT NULL,
`name_a` varchar(255) DEFAULT NULL,
`name_e` varchar(255) DEFAULT NULL,
`nature` tinyint(1) DEFAULT '0',
`currency_id` bigint(20) NOT NULL DEFAULT '0',
`currency_rate` varchar(200) DEFAULT NULL,
`match_date` date DEFAULT NULL,
`notes` text,
`created` datetime NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
--
-- Dumping data for table `accounts_tree`
--
INSERT INTO `accounts_tree` (`id`, `parent_id`, `final_acc_id`, `Code`, `name_a`, `name_e`, `nature`, `currency_id`, `currency_rate`, `match_date`, `notes`, `created`) VALUES
(1, 0, 1, '1', 'folder 1', 'budget', 0, 1, '1', NULL, NULL, '2017-12-16 00:00:00'),
(2, 0, 1, '1', 'folder 2', 'budget2', 0, 1, '1', NULL, NULL, '2017-12-16 00:00:00'),
(3, 1, 1, '1', 'sub 1-1', 'balance sheet', 0, 1, '1', NULL, NULL, '2017-12-16 00:00:00'),
(4, 2, 1, '1', 'sub 2-1', 'balance sheet', 0, 1, '1', NULL, NULL, '2017-12-16 00:00:00'),
(5, 3, 1, '1', 'Sub 1-1-1', 'balance sheet', 0, 1, '1', NULL, NULL, '2017-12-16 00:00:00'),
(6, 0, 1, '3', 'folder 3', 'balance sheet', 0, 1, '1', NULL, NULL, '2017-12-16 00:00:00'),
(7, 5, 1, '3', 'sub 1-1-1-1', 'balance sheet', 0, 1, '1', NULL, NULL, '2017-12-16 00:00:00');
PHP用于生成数组
$query = "SELECT * FROM `accounts_tree`";
$result = $db->query($query);
$output = array();
while ($row = $db->fetch_assoc($result)) {
$sub_data["id"] = $row["id"];
$sub_data["name"] = $row["name_a"];
$sub_data["parent_id"] = $row["parent_id"];
$data[] = $sub_data;
}
foreach ($data as $key => &$value) {
$output[$value["id"]] = &$value;
}
foreach ($data as $key => &$value) {
if ($value["parent_id"] && isset($output[$value["parent_id"]])) {
$output[$value["parent_id"]]["nodes"][] = &$value;
}
}
foreach ($data as $key => & $value ) {
if ($value["parent_id"] && isset($output[$value["parent_id"]])) {
unset($data[$key]);
}
}
EDITED
输出数组将是
Array
(
[0] => Array
(
[id] => 1,
[name] => "folder 1",
[parent_id] => 0,
[nodes] => Array
(
[0] => Array
(
[id] => 3,
[name] => "sub 1-1",
[parent_id] => 1,
[nodes] => Array
(
[0] => Array
(
[id] => 5,
[name] => "Sub 1-1-1",
[parent_id] => 3,
[nodes] => Array
(
[0] => Array
(
[id] => 7,
[name] => "sub1-1-1-1",
[parent_id] => 5
)
)
)
)
)
)
),
[1] => Array
(
[id] => 2,
[name] => "folder 2",
[parent_id] => 0,
[nodes] => Array
(
[0] => Array
(
[id] => 4,
[name] => "sub 2-1",
[parent_id] => 2
)
)
),
[5] => Array
(
[id] => 6,
[name] => "folder 3",
[parent_id] => 0
)
);
我们只需要收集名称并将其放在树状视图中 请任何人都可以解决这个问题：S
感谢
答案 0 :(得分：1)
解释可以作为内联注释找到。此功能提供您所需的精确输出。另请注意我已重写的查询以设置$resultset。
代码：（Demo）
function findParent(&$array,$parentid=0,$childarray=[]){ // make $array modifiable
foreach($array as $i=>&$row){ // make $row modifiable
if($parentid){ // if not zero
if($row['id']==$parentid){ // found parent
$row['nodes'][]=$childarray; // append child to parent's nodes subarray
}elseif(isset($row['nodes'])){ // go down rabbit hole looking for parent
findParent($row['nodes'],$parentid,$childarray); // look deeper for parent while preserving the initial parent_id and row
} // else continue;
}elseif($row['parent_id']){ // child requires adoption
unset($array[$i]); // remove child from level because it will be store elsewhere and won't be its own parent (reduce iterations in next loop & avoid infinite recursion)
findParent($array,$row['parent_id'],$row); // look for parent using parent_id while carrying the entire row as the childarray
} // else continue;
}
return $array; // return the modified array
}
// $db->query('SELECT id,name_a AS name,parent_id FROM accounts_tree ORDER BY id');
// for($resultset=[]; $row=$res->fetch_assoc(); $resultset[]=$row); // inspired by: http://php.net/manual/en/mysqli-result.fetch-assoc.php#112924
$resultset=[
['id'=>1,'name'=>'folder 1','parent_id'=>0],
['id'=>2,'name'=>'folder 2','parent_id'=>0],
['id'=>3,'name'=>'sub 1-1','parent_id'=>1],
['id'=>4,'name'=>'sub 2-1','parent_id'=>2],
['id'=>5,'name'=>'Sub 1-1-1','parent_id'=>3],
['id'=>6,'name'=>'folder 3','parent_id'=>0],
['id'=>7,'name'=>'sub 1-1-1-1','parent_id'=>5]
];
print_r(findParent($resultset));
输出：
Array
(
[0] => Array
(
[id] => 1
[name] => folder 1
[parent_id] => 0
[nodes] => Array
(
[0] => Array
(
[id] => 3
[name] => sub 1-1
[parent_id] => 1
[nodes] => Array
(
[0] => Array
(
[id] => 5
[name] => Sub 1-1-1
[parent_id] => 3
[nodes] => Array
(
[0] => Array
(
[id] => 7
[name] => sub 1-1-1-1
[parent_id] => 5
)
)
)
)
)
)
)
[1] => Array
(
[id] => 2
[name] => folder 2
[parent_id] => 0
[nodes] => Array
(
[0] => Array
(
[id] => 4
[name] => sub 2-1
[parent_id] => 2
)
)
)
[5] => Array
(
[id] => 6
[name] => folder 3
[parent_id] => 0
)
)