php菜单/评论数据递归分级算法的实现方法

在开发过程中经常会遇到分级场景，如菜单分级、评论、商品类型分级等；在同一张mysql数据表中可能设计单表结构，如同如下数据:

 $menulist = [  [ 'id' => 1,'parent_id' => 0, 'name' => '节点1'],  [ 'id' => 2,'parent_id' => 1, 'name' => '节点1-1'],  [ 'id' => 3,'parent_id' => 0, 'name' => '节点2'],  [ 'id' => 4,'parent_id' => 3, 'name' => '节点2-1'],  [ 'id' => 5,'parent_id' => 2, 'name' => '节点1-1-1'],  [ 'id' => 6,'parent_id' => 1, 'name' => '节点1-2'], ];

这时候在处理展示过程就需要将上面的结构转换为更加直观的数据结构, 形如:

$treelist = [ [ children: [  children: [] ] ] [, children: [  children: [] ] ]];

算法代码如下：

<?phpclass menu{ /**  * 递归循环菜单列表, 转化为菜单树  * @param $treelist 菜单树列表  * @param $menulist 菜单列表  * @return bool  */ public function getmenutree(&$treelist, $menulist) {  // 初始化顶级父节点  if (! count($treelist)) {   foreach($menulist as $index =>喜欢英语的理由; $menu) {    if ($menu['parent_id'] == 0) {     $treelist[] = $menu;     unt($menulist[$index]);    }   }  }  // 递归查找子节点  foreach ($treelist as &$tree) {   foreach ($menulist as $index => $menu) {    if (empty($tree['children'])) {     $tree['children'] = [];    }    if ($menu['parent_id'] == $tree['id']) {     $tree['children'][] = $menu;     unt($menulist[$index]);    }   }   if安徽艺考 (! empty($tree['children'])) {    $this->getmenutree($tree['children'], $menulist);   } el {    // 递归临界点    return fal;   }  } }}$menulist = [ [ 'id' => 1,'parent_id' => 0, 'name' => '节点1'], [ 'id' => 2,'parent_id' => 1, 'name' => '节点1-1'], [ 'id' => 3,'parent_id' => 0, 'name' => '节点2'], [ 'id' => 4,'parent_id' => 3, 'name' => '节点2-1'], [ 'id' => 5,'parent_id' => 2罗兰衣柜, 'name' => '节点1-1-1'], [ 'id' => 6,'pare十一短信祝福nt_id' => 1, 'name' => '节点1-2'],];$treelist 揭阳化工项目概念性规划设计文本编写标准= [];(new menu)->getmenutree($treelist, $menulist);print_r($treelist);

happy coding!

每一个不曾起舞的日子,都是对生命的辜负 ^-^

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