PHP 無限級分類(遞歸)


網上有很多,這是我自己做測試用的


$arr = array(
array('id'=>1,'name'=>'電腦','pid'=>0),
array('id'=>2,'name'=>'手機','pid'=>0),
array('id'=>3,'name'=>'筆記本','pid'=>1),
array('id'=>4,'name'=>'台式機','pid'=>1),
array('id'=>5,'name'=>'智能機','pid'=>2),
array('id'=>6,'name'=>'功能機','pid'=>2),
array('id'=>7,'name'=>'超級本','pid'=>3),
array('id'=>8,'name'=>'游戲本','pid'=>3),
);

/**
* @param $arr 數組
* @param $id id
* @param $level 層級
* @return array
*/
function demo($arr,$id,$level)
{
$list =array();
foreach ($arr as $k=>$v){
if ($v['pid'] == $id){
$v['level']=$level;
$v['son'] = demo($arr,$v['id'],$level+1);
$list[] = $v;
}
}
return $list;
}
echo "<pre>";
print_r(demo($arr,0,0));


輸出結果:
Array
(
    [0] => Array
        (
            [id] => 1
            [name] => 電腦
            [pid] => 0
            [level] => 0
            [son] => Array
                (
                    [0] => Array
                        (
                            [id] => 3
                            [name] => 筆記本
                            [pid] => 1
                            [level] => 1
                            [son] => Array
                                (
                                    [0] => Array
                                        (
                                            [id] => 7
                                            [name] => 超級本
                                            [pid] => 3
                                            [level] => 2
                                            [son] => Array
                                                (
                                                )

                                        )

                                    [1] => Array
                                        (
                                            [id] => 8
                                            [name] => 游戲本
                                            [pid] => 3
                                            [level] => 2
                                            [son] => Array
                                                (
                                                )

                                        )

                                )

                        )

                    [1] => Array
                        (
                            [id] => 4
                            [name] => 台式機
                            [pid] => 1
                            [level] => 1
                            [son] => Array
                                (
                                )

                        )

                )

        )

    [1] => Array
        (
            [id] => 2
            [name] => 手機
            [pid] => 0
            [level] => 0
            [son] => Array
                (
                    [0] => Array
                        (
                            [id] => 5
                            [name] => 智能機
                            [pid] => 2
                            [level] => 1
                            [son] => Array
                                (
                                )

                        )

                    [1] => Array
                        (
                            [id] => 6
                            [name] => 功能機
                            [pid] => 2
                            [level] => 1
                            [son] => Array
                                (
                                )

                        )

                )

        )

)
 


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