php两种无限分类方法实例_PHP

一、递归方法

<br />$items = array(<br />array('id'=>1,'pid'=>0,'name'=>'一级11'),<br />array('id'=>2,'pid'=>0,'name'=>'一级12'),<br />array('id'=>3,'pid'=>1,'name'=>'二级21'),<br />array('id'=>4,'pid'=>3,'name'=>'三级31'),<br />array('id'=>5,'pid'=>1,'name'=>'二级22'),<br />array('id'=>6,'pid'=>3,'name'=>'三级32'),<br />array('id'=>7,'pid'=>6,'name'=>'四级41'),<br />);<br />$i = 0;<br />function formatTree($arr, $pid = 0){<br />$tree = array();<br />$temp = array();<br />global $i;<br />if($arr){<br />foreach($arr as $k=>$v){<br />if($v['pid'] == $pid){//<br />$temp = formatTree($arr, $v['id']);<br />$temp && $v['son'] = $temp;<br />$tree[] = $v;<br />}<br />}<br />}<br />return $tree;<br />}<br />print_r(formatTree($items));<br />

二、非递归方法

<br />function genTree($items) {<br />    $tree = array(); //格式化好的树<br />    foreach ($items as $item)<br />        if (isset($items[$item['pid']])){<br />            $items[$item['pid']]['son'][] = &$items[$item['id']];<br />        }<br />        else{<br />            $tree[] = &$items[$item['id']];<br />        }<br />    return $tree;<br />}

$items = array(
1 => array(‘id’ => 1, ‘pid’ => 0, ‘name’ => ‘一级11’),
2 => array(‘id’ => 2, ‘pid’ => 1, ‘name’ => ‘二级21’),
3 => array(‘id’ => 3, ‘pid’ => 1, ‘name’ => ‘二级23’),
4 => array(‘id’ => 4, ‘pid’ => 9, ‘name’ => ‘三级31’),
5 => array(‘id’ => 5, ‘pid’ => 4, ‘name’ => ‘四级43’),
6 => array(‘id’ => 6, ‘pid’ => 9, ‘name’ => ‘三级32’),
7 => array(‘id’ => 7, ‘pid’ => 4, ‘name’ => ‘四级41’),
8 => array(‘id’ => 8, ‘pid’ => 4, ‘name’ => ‘四级42’),
9 => array(‘id’ => 9, ‘pid’ => 1, ‘name’ => ‘二级25’),
10 => array(‘id’ => 10, ‘pid’ => 11, ‘name’ => ‘二级22’),
11 => array(‘id’ =本@文来源gao($daima.com搞@代@#码(网5搞gaodaima代码> 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));

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