夺命雷公狗---无限级分类NO3

<?phpheader("Content-Type:text/html;charset=utf-8");/*无限级分类。牵扯2个应用0是-找指定栏目的子栏目1是-找指定栏目的子孙栏目，即子孙树2是-找指定栏目的父栏目/父父栏目....顶级栏目，即家谱树*/$aarr = array(array('id'=>1,'name'=>'安徽','pid'=>0),array('id'=>2,'name'=>'海淀','pid'=>7),array('id'=>3,'name'=>'浣溪县','pid'=>5),array('id'=>4,'name'=>'昌平','pid'=>7),array('id'=>5,'name'=>'淮北','pid'=>1),array('id'=>6,'name'=>'朝阳','pid'=>7),array('id'=>7,'name'=>'北京','pid'=>0),array('id'=>8,'name'=>'上地','pid'=>2));function subtree($arr,$id=0,$lev=1){$subs = array(); //子孙树foreach($arr as $v){if($v['pid'] == $id){$v['lev'] = $lev;$subs[] = $v;$subs = array_merge($subs,subtree($arr,$v['id'],$lev+1));//array_merge让数组粘起来
            }}return $subs;}$tree = subtree($aarr,0,1);foreach($tree as $v){echo str_repeat('&nbsp;&nbsp;',$v['lev']).$v['name'].'<br/>';//str_repeat替换}