php两种无限分类方法实例

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我是靠谱客的博主飘逸白开水，最近开发中收集的这篇文章主要介绍php两种无限分类方法实例，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

一、递归方法

复制代码代码如下:

$items = array(

array('id'=>1,'pid'=>0,'name'=>'一级11'),

array('id'=>2,'pid'=>0,'name'=>'一级12'),

array('id'=>3,'pid'=>1,'name'=>'二级21'),

array('id'=>4,'pid'=>3,'name'=>'三级31'),

array('id'=>5,'pid'=>1,'name'=>'二级22'),

array('id'=>6,'pid'=>3,'name'=>'三级32'),

array('id'=>7,'pid'=>6,'name'=>'四级41'),

);

$i = 0;

function formatTree($arr, $pid = 0){

$tree = array();

$temp = array();

global $i;

if($arr){

foreach($arr as $k=>$v){

if($v['pid'] == $pid){//

$temp = formatTree($arr, $v['id']);

$temp && $v['son'] = $temp;

$tree[] = $v;

}

}

}

return $tree;

}

print_r(formatTree($items));

二、非递归方法

复制代码代码如下:

$items = array(
    1 => array('id' => 1, 'pid' => 0, 'name' => '一级11'),
    2 => array('id' => 2, 'pid' => 1, 'name' => '二级21'),
    3 => array('id' => 3, 'pid' => 1, 'name' => '二级23'),
    4 => array('id' => 4, 'pid' => 9, 'name' => '三级31'),
    5 => array('id' => 5, 'pid' => 4, 'name' => '四级43'),
    6 => array('id' => 6, 'pid' => 9, 'name' => '三级32'),
    7 => array('id' => 7, 'pid' => 4, 'name' => '四级41'),
    8 => array('id' => 8, 'pid' => 4, 'name' => '四级42'),
    9 => array('id' => 9, 'pid' => 1, 'name' => '二级25'),
    10 => array('id' => 10, 'pid' => 11, 'name' => '二级22'),
    11 => array('id' => 11, 'pid' => 0, 'name' => '一级12'),
    12 => array('id' => 12, 'pid' => 11, 'name' => '二级24'),
    13 => array('id' => 13, 'pid' => 4, 'name' => '四级44'),
    14 => array('id' => 14, 'pid' => 1, 'name' => '二级26'),
    15 => array('id' => 15, 'pid' => 8, 'name' => '五级51'),
    16 => array('id' => 16, 'pid' => 8, 'name' => '五级52'),
    17 => array('id' => 17, 'pid' => 8, 'name' => '五级53'),
    18 => array('id' => 18, 'pid' => 16, 'name' => '六级64'),
);
print_r(genTree($items));