search
Homephp教程php手册PHP数组无限分级数据的层级化处理代码

PHP数组无限分级数据的层级化处理代码

Jun 13, 2016 am 11:55 AM
phpcodeGradinglistcreateparameterdeal withcopyHierarchydataarrayunlimitedfatherofnode

复制代码 代码如下:


/**
 * 创建父节点树形数组
 * 参数
 * $ar 数组,邻接列表方式组织的数据
 * $id 数组中作为主键的下标或关联键名
 * $pid 数组中作为父键的下标或关联键名
 * 返回 多维数组
 **/
function find_parent($ar, $id='id', $pid='pid') {
  foreach($ar as $v) $t[$v[$id]] = $v;
  foreach ($t as $k => $item){
    if( $item[$pid] ){
      if( ! isset($t[$item[$pid]]['parent'][$item[$pid]]) )
         $t[$item[$id]]['parent'][$item[$pid]] =& $t[$item[$pid]];
          $t[$k]['reference'] = true;
    }
  }
  return $t;
}
/**
 * 创建子节点树形数组
 * 参数
 * $ar 数组,邻接列表方式组织的数据
 * $id 数组中作为主键的下标或关联键名
 * $pid 数组中作为父键的下标或关联键名
 * 返回 多维数组
 **/
function find_child($ar, $id='id', $pid='pid') {
  foreach($ar as $v) $t[$v[$id]] = $v;
  foreach ($t as $k => $item){
    if( $item[$pid] ) {
      $t[$item[$pid]]['child'][$item[$id]] =& $t[$k];
      $t[$k]['reference'] = true;
    }
  }
  return $t;
}


示例:

复制代码 代码如下:


$data = array(
    array('ID'=>1, 'PARENT'=>0, 'NAME'=>'祖父'),
    array('ID'=>2, 'PARENT'=>1, 'NAME'=>'父亲'),
    array('ID'=>3, 'PARENT'=>1, 'NAME'=>'叔伯'),
    array('ID'=>4, 'PARENT'=>2, 'NAME'=>'自己'),
    array('ID'=>5, 'PARENT'=>4, 'NAME'=>'儿子')
);
$p = find_parent($data, 'ID', 'PARENT');
$c = find_child($data, 'ID', 'PARENT');


上面两种方法是将所有节点按id平摊到一个数组中,然后找到他们的 parent 或 children ,通过引用将 平摊的元素挂接到 parent 、children 下,
但被引用的元素依然存在于平摊的数组中,因此,在实际应用时,最好标记那些被引用的元素,以避免以他们为根开始遍历,导致重复。

复制代码 代码如下:


        foreach ($p as $key => $item) {
            if($item['reference']) continue;
            print_r($item);
        }
        foreach ($c as $key => $item) {
            if($item['reference']) continue;
            print_r($item);
        }


递归法,PHP 数组元素被删除后,数组游标会归零,因此在遍历过程中一些已经找到 “归宿” 的元素也不得不留在数组中,无法缩减后继元素的搜索范围:

复制代码 代码如下:


$mylist = array(array( 'parent_id'=>0,'id'=>1),
                    array( 'parent_id'=>0,'id'=>2),
                    array( 'parent_id'=>0,'id'=>3),   
                    array( 'parent_id'=>2,'id'=>4),
                    array( 'parent_id'=>2,'id'=>5),
                    array( 'parent_id'=>3,'id'=>6),
                    array( 'parent_id'=>3,'id'=>7),   
                    array( 'parent_id'=>4,'id'=>8),
                    array( 'parent_id'=>5,'id'=>9),
                    array( 'parent_id'=>5,'id'=>10)
                );

    function _findChildren($list, $p_id){    //数据层级化,
          $r = array();
          foreach($list as $id=>$item){
            if($item['parent_id'] == $p_id) {
                   $length = count($r);
                  $r[$length] = $item;
                  if($t = $this->_findChildren($list, $item['id']) ){
                      $r[$length]['children'] = $t;
                  }               
            }
          }
          return $r;
    } 

print_r(_findChildren($mylist, 0));

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

DVWA

DVWA

Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Dreamweaver Mac version

Dreamweaver Mac version

Visual web development tools