php实现递归与无限分类的方法

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<?php

echo "<pre>";

$area = array(

array('id'=>1,'area'=>'北京','pid'=>0),

array('id'=>2,'area'=>'广西','pid'=>0),

array('id'=>3,'area'=>'广东','pid'=>0),

array('id'=>4,'area'=>'福建','pid'=>0),

array('id'=>11,'area'=>'朝阳区','pid'=>1),

array('id'=>12,'area'=>'海淀区','pid'=>1),

array('id'=>21,'area'=>'南宁市','pid'=>2),

array('id'=>45,'area'=>'福州市','pid'=>4),

array('id'=>113,'area'=>'亚运村','pid'=>11),

array('id'=>115,'area'=>'奥运村','pid'=>11),

array('id'=>234,'area'=>'武鸣县','pid'=>21)

);

function t($arr,$pid=0,$lev=0){

static $list = array();

foreach($arr as $v){

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

echo str_repeat(" ",$lev).$v['area']."<br />";

//这里输出，是为了看效果

$list[] = $v;

t($arr,$v['id'],$lev+1);

}

}

return $list;

}

$list = t($area);

echo "<hr >";

print_r($list);

?>