小贝子编程

PHP 算法递归树



我正在修改一个开源脚本，以通过组织结构图样式显示家谱。

具有具有 ID 和父 ID 字段的用户表。

当我打开时/viewOrgChart？user_id=1 或数字不在 2 3 4 5 中，效果很好！

但是当我用 2 3 4 5 打开user_id时，它抛出错误：试图获取非对象的属性"parentid" $us->parentid 内部有另一个级别数组......错误只发生在这几个用户 ID 上...

/viewOrgChart?user_id=2
/viewOrgChart?user_id=3
/viewOrgChart?user_id=4
/viewOrgChart?user_id=5

无法弄清楚这里出了什么问题。

我还想根据传入的user_id限制要显示的级别数。 假设我以 user_id=1 传入，并且我只想显示最多 4 级的所有内容

(在这种情况下，它应该显示到级别 firstname=eng，低于 eng 级别都不需要显示) 但。。。去哪。。

有算法专家吗？

<?php
function wpmlm_get_all_user_details_join() {
$sql = "SELECT * FROM users";
$results = DB::select($sql);
return $results;
}
function wpmlm_get_user_details_by_id_join($user_id) {
$sql = "SELECT * FROM users where id = '" . $user_id . "'";
$results = DB::select($sql);
return $results;
}
function wpmlm_makeNested($source) {
$nested = array();

foreach ($source as &$s) {
if (is_null($s['parent_id'])) {
// no parent_id so we put it in the root of the array
$nested[] = &$s;
} else {
$pid = $s['parent_id'];
if (isset($source[$pid])) {

if (!isset($source[$pid]['children'])) {
$source[$pid]['children'] = array();
}

$source[$pid]['children'][] = &$s;
}
}
}
return $nested;
}    
function wpmlm_buildTree(array $elements, $parentId) {
static $counter = 0;
++$counter;
$tree = array();
foreach ($elements as $element) {
if ($element->id == $parentId) {
if ($counter == 1) {
$tree[] = $this->wpmlm_get_user_details_by_id_join($parentId);
}
}
if ($element->parentid == $parentId) {
$children = $this->wpmlm_buildTree($elements, $element->id);
if ($children) {
$tree[] = $children;
}

$tree[] = $element;
}
}
return $tree;
}  
public function flattenArray($arr) 
{
for ($i = 0; $i < count($arr); $i++) {
if (is_array($arr[$i])) {
array_splice($arr, $i, 1, $arr[$i]);
}
}
return $arr;
}
public function viewOrgChart(Request $request)
{
$user_id = $request->user_id;
$user_details = $this->wpmlm_get_all_user_details_join();

//$tree = $this->wpmlm_buildTree(elements, parentId);        
$tree = $this->wpmlm_buildTree($user_details, $user_id);

foreach ($tree as $key => $data) 
{
$test = $key; 

if (is_array($data)) {
foreach ($data as $sub_data) {
$tree = $this->flattenArray($tree);
}
}
}
$arr = array();
$count = 0;
foreach ($tree as $us) 
{
$count++;
if ($count == 1) {
$parent_id = null;
} else {
$parent_id = $us->parentid; //fail at here ERROR
}
$arr[$us->id] = Array(
'name' => $us->firstname,
'user_id' => $us->id,
'user_code' => $us->usercode,          
'parent_id' => $parent_id,
'email' => $us->email,
);
}

$uniLevelTree = $this->wpmlm_makeNested($arr);

$treeJson = json_encode($uniLevelTree[0]);  

}
?>
<div id="unilevel-tree">
<div class="panel-border">            
<div id="chart-container"></div>
<div id="test"></div>
</div>
</div>
<link rel='stylesheet' id='wp-mlm-bootstrap-css-css'  href='https://wpmlmsoftware.com/unilevel-mlm-demo/wp-content/plugins/wp-mlm/css/bootstrap.min.css?ver=5.2.1' type='text/css' media='all' />
<link rel='stylesheet' id='wp-mlm-font-awesome-css-css'  href='https://wpmlmsoftware.com/unilevel-mlm-demo/wp-content/plugins/wp-mlm/css/font-awesome.min.css?ver=5.2.1' type='text/css' media='all' />
<link rel='stylesheet' id='wp-mlm-orgchart-style-css-css'  href='https://wpmlmsoftware.com/unilevel-mlm-demo/wp-content/plugins/wp-mlm/css/orgchart-style.css?ver=5.2.1' type='text/css' media='all' />
<link rel='stylesheet' id='orgchart-css-css'  href='https://wpmlmsoftware.com/unilevel-mlm-demo/wp-content/plugins/wp-mlm/css/jquery.orgchart.css?ver=5.2.1' type='text/css' media='all' />
<link rel='stylesheet' id='admin-wp-mlm-style-css'  href='https://wpmlmsoftware.com/unilevel-mlm-demo/wp-content/plugins/wp-mlm/css/style.css?ver=5.2.1' type='text/css' media='all' />
<script type='text/javascript' src='https://wpmlmsoftware.com/unilevel-mlm-demo/wp-admin/load-scripts.php?c=0&amp;load%5B%5D=jquery-core,jquery-migrate,utils&amp;ver=5.2.1'></script>
<script type='text/javascript' src='https://wpmlmsoftware.com/unilevel-mlm-demo/wp-content/plugins/wp-mlm/js/bootstrap.min.js?ver=5.2.1'></script>
<script type='text/javascript' src='https://wpmlmsoftware.com/unilevel-mlm-demo/wp-content/plugins/wp-mlm/js/bootstrap-datepicker.js?ver=5.2.1'></script>
<script type='text/javascript' src='https://wpmlmsoftware.com/unilevel-mlm-demo/wp-content/plugins/wp-mlm/js/jquery.orgchart.js?ver=5.2.1'></script> 

<script type="text/javascript">
jQuery( document ).ready( function( $ ) {
var datasource =<?php echo $treeJson; ?>
var nodeTemplate = function(data) {
return `
<span class = "user-image d-flex justify-content-center" >
<img src = "https://wpmlmsoftware.com/unilevel-mlm-demo/wp-content/plugins/wp-mlm/images/user.png" > 
</span>
<div class = "title" > ${data.name} </div>
<div class = "" > ${data.email} </div>
<div class = "" > ${data.user_id} </div>   
`;
};
var oc = $('#chart-container').orgchart({
'data' : datasource,
'nodeTemplate': nodeTemplate
});
});

</script>

.SQL：

CREATE TABLE `users` (
`id` bigint(20) UNSIGNED NOT NULL,
`email` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL,
`created_at` timestamp NULL DEFAULT NULL,
`firstname` varchar(255) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
`parentid` int(10) UNSIGNED DEFAULT NULL
);
INSERT INTO `users` (`id`, `firstname`, `email`, `created_at`, `usercode`, `parentid`) VALUES
(1, 'andrew', 'test1@gmail.com', '2020-11-24 05:22:42', 'MB800001', 0),
(2, 'beta', 'test2@gmail.com', '2020-11-24 05:22:42', NULL, 1),
(3, 'cicak', 'test3@gmail.com', '2020-11-24 05:22:42', NULL, 2),
(4, 'dorae', 'test4@gmail.com', '2020-11-24 05:22:43', NULL, 3),
(5, 'eng', 'test5@gmail.com', '2020-11-24 05:22:43', NULL, 4),
(6, 'Fanny', 'test6@gmail.com', '2020-11-24 05:22:43', NULL, 5),
(7, 'Gary', 'test7@gmail.com', '2020-11-24 05:22:43', NULL, 6),
(8, 'Hafiz', 'test8@gmail.com', '2020-11-24 05:22:43', NULL, 7),
(9, 'Isaac', 'test9@gmail.com', '2020-11-24 05:22:43', NULL, 8),
(10, 'louis', 'test10@gmail.com', '2020-11-24 05:22:44', NULL, 1),
(11, 'shze', 'test11@gmail.com', '2020-11-24 05:22:44', NULL, 1),
(12, 'paul', 'test12@gmail.com', '2020-11-24 05:22:44', NULL, 10),
(13, 'eunice', 'test13@gmail.com', '2020-11-24 05:22:44', NULL, 10),
(14, 'shaun', 'test14@gmail.com', '2020-11-24 05:22:44', NULL, 11),
(15, 'xiao', 'test15@gmail.com', '2020-11-24 05:22:44', NULL, 11),
(16, 'hui', 'test16@gmail.com', '2020-11-24 05:22:44', NULL, 11),
(17, 'gen', 'test17@gmail.com', '2020-11-24 05:22:45', NULL, 16),
(18, 'hani', 'test18@gmail.com', '2020-11-24 05:22:45', NULL, 17),
(19, 'hola', 'test19@gmail.com', '2020-11-24 05:22:45', NULL, 18),
(20, 'hugo', 'test20@gmail.com', '2020-11-24 05:22:45', NULL, 19),
(21, 'lady', 'test21@gmail.com', '2020-11-24 05:22:45', NULL, 18);

这是我写的一个类，它应该可以满足你的需要：

<?php
class OrgTree {
public $users;
public function __construct($users) {
$this->users = $users;
}
private function getUserById($userId) {
return array_values(array_filter($this->users, function($user) use ($userId) {
return $user['id'] === $userId;
}))[0] ?? null;
}
private function getUsersByParentId($parentId) {
return array_values(array_filter($this->users, function($user) use ($parentId) {
return $user['parentid'] === $parentId;
}));
}

private function buildTree($userDetails, $maxDepth, $currentDepth = 0) 
{
$info = [
"name" => $userDetails['firstname'],
"user_id" => $userDetails['id'],
"user_code" => $userDetails['usercode'],
"parent_id" => $userDetails['parentid'],
"email" => $userDetails['email'],
];
if ($maxDepth > $currentDepth) {
$childUsers = $this->getUsersByParentId($userDetails['id']);
$nextDepth = ++$currentDepth;
$info['children'] = array_map(function($childUser) use ($nextDepth, $maxDepth) {
return $this->buildTree($childUser, $maxDepth, $nextDepth);
}, $childUsers);
}
return $info;
}

public function createOrgTree($userId, $maxDepth = 4) {
return $this->buildTree($this->getUserById($userId), $maxDepth);
}
}

您只需要从数据库传入用户：

public function viewOrgChart(Request $request) {
$user_id = $request->user_id;
$depth = 4; // get this from request if needed
$user_details = $this->wpmlm_get_all_user_details_join();

$orgTree = new OrgTree($user_details);
$tree = $orgTree->createOrgTree($user_id, $depth);
$treeJson = json_encode($tree);
}

您还可以根据需要更改类以从数据库中提取用户，而不是在开始时接收完整列表，就像您有大量用户一样，这种方法会更有效，尤其是在低$depth值的情况下。

为此，您只需删除：

public $users;
public function __construct($users) {
$this->users;
}

并更改getUserById和getUsersByParentId以执行 SQL 查询并返回数据。

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