php数组递归方法多个实例

php数组递归方法

有如下php数组：

2. function genTree5($items) {
3. foreach ($items as $item)
4. $items[$item['pid']]['son'][$item['id']] = &$items[$item['id']];
5. return isset($items[0]['son']) ? $items[0]['son'] : array();
6. }

方法二：

3. function findChild($arr,$id){

4. $childs=array();
5. foreach ($arr as $k => $v){
6. if($v['pid']== $id){
7. $childs[]=$v;
8. }
9. }
10. // echo "

    ";print_r($childs);die(); 
        return $childs; 
    }
    function build_tree($root_id){ 
        global $items; 
        $childs =array(); 
        $childs=findChild($items,$root_id); 
    //    print_r($childs); 
    //    die(); 
        if(empty($childs)){ 
            return null; 
        } 
       foreach ($childs as $k => $v){ 
           $rescurTree=build_tree($v['id']); 
           if( null !=   $rescurTree){ 
           $childs[$k]['son']=$rescurTree; 
           } 
       } 
        return $childs; 
    }