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php兩種無(wú)限分類方法實(shí)例

更新時(shí)間：2015年04月21日 09:44:17 投稿：junjie

這篇文章主要介紹了php兩種無(wú)限分類方法實(shí)例,本文給出了遞歸方法和非遞歸方法實(shí)現(xiàn)的無(wú)限分類實(shí)例,需要的朋友可以參考下

一、遞歸方法

$items = array(

array('id'=>1,'pid'=>0,'name'=>'一級(jí)11'),

array('id'=>2,'pid'=>0,'name'=>'一級(jí)12'),

array('id'=>3,'pid'=>1,'name'=>'二級(jí)21'),

array('id'=>4,'pid'=>3,'name'=>'三級(jí)31'),

array('id'=>5,'pid'=>1,'name'=>'二級(jí)22'),

array('id'=>6,'pid'=>3,'name'=>'三級(jí)32'),

array('id'=>7,'pid'=>6,'name'=>'四級(jí)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、非遞歸方法

復(fù)制代碼代碼如下:

$items = array(
    1 => array('id' => 1, 'pid' => 0, 'name' => '一級(jí)11'),
    2 => array('id' => 2, 'pid' => 1, 'name' => '二級(jí)21'),
    3 => array('id' => 3, 'pid' => 1, 'name' => '二級(jí)23'),
    4 => array('id' => 4, 'pid' => 9, 'name' => '三級(jí)31'),
    5 => array('id' => 5, 'pid' => 4, 'name' => '四級(jí)43'),
    6 => array('id' => 6, 'pid' => 9, 'name' => '三級(jí)32'),
    7 => array('id' => 7, 'pid' => 4, 'name' => '四級(jí)41'),
    8 => array('id' => 8, 'pid' => 4, 'name' => '四級(jí)42'),
    9 => array('id' => 9, 'pid' => 1, 'name' => '二級(jí)25'),
    10 => array('id' => 10, 'pid' => 11, 'name' => '二級(jí)22'),
    11 => array('id' => 11, 'pid' => 0, 'name' => '一級(jí)12'),
    12 => array('id' => 12, 'pid' => 11, 'name' => '二級(jí)24'),
    13 => array('id' => 13, 'pid' => 4, 'name' => '四級(jí)44'),
    14 => array('id' => 14, 'pid' => 1, 'name' => '二級(jí)26'),
    15 => array('id' => 15, 'pid' => 8, 'name' => '五級(jí)51'),
    16 => array('id' => 16, 'pid' => 8, 'name' => '五級(jí)52'),
    17 => array('id' => 17, 'pid' => 8, 'name' => '五級(jí)53'),
    18 => array('id' => 18, 'pid' => 16, 'name' => '六級(jí)64'),
);
print_r(genTree($items));