欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  php教程

PHP递归实现层级树状展开_php技巧

程序员文章站 2022-05-31 09:40:49
...
这篇文章主要为大家详细介绍了PHP递归实现层级树状展开的相关资料,需要的朋友可以参考下

本文实例为大家分享了PHP递归实现层级树状展开的主要代码,供大家参考,具体内容如下

效果图:

PHP递归实现层级树状展开_php技巧

实现代码:

<?php 
  
$db = mysql_connect('localhost', 'root', 'root') or die('Can\'t connect to database'); 
mysql_select_db('test') or die('Can\'t find database : test'); 
$result = mysql_query('select id, fid, name from tree'); 
while($arr = mysql_fetch_array($result)){ 
  $data[] = array( 
    'id' => $arr['id'],  
    'fid' => $arr['fid'], 
    'name' => $arr['name'],  
  ); 
} 
  
// 将数据按照缩进简单排列 见图1 
function data2arr($tree, $rootId = 0, $level = 0) { 
  foreach($tree as $leaf) { 
    if($leaf['fid'] == $rootId) { 
      echo str_repeat('    ', $level) . $leaf['id'] . ' ' . $leaf['name'] . '<br/>'; 
      foreach($tree as $l) { 
        if($l['fid'] == $leaf['id']) { 
          data2arr($tree, $leaf['id'], $level + 1); 
          break; 
        } 
      } 
    } 
  } 
} 
  
data2arr($data); 
echo '<br/>-----------------------------------------------------------------------<br/>'; 
  
// 将数据按照所属关系封装 见图2 
function arr2tree($tree, $rootId = 0) { 
  $return = array(); 
  foreach($tree as $leaf) { 
    if($leaf['fid'] == $rootId) { 
      foreach($tree as $subleaf) { 
        if($subleaf['fid'] == $leaf['id']) { 
          $leaf['children'] = arr2tree($tree, $leaf['id']); 
          break; 
        } 
      } 
      $return[] = $leaf; 
    } 
  } 
  return $return; 
} 
  
$tree = arr2tree($data); 
print_r($tree); 
echo '<br/>-----------------------------------------------------------------------<br/>'; 
  
// 将数据使用HTML再次展现 见图3 
function tree2html($tree) { 
  echo '<ul>'; 
  foreach($tree as $leaf) { 
    echo '<li>' .$leaf['name']; 
    if(! emptyempty($leaf['children'])) tree2html($leaf['children']); 
    echo '</li>'; 
  } 
  echo '</ul>'; 
} 
  
tree2html($tree);

以上就是本文的全部内容,希望对大家学习php程序设计有所帮助。