求一个数组算法

[php_way]

根据 “数组1” 和 “数组2”，得到 “数组3”这样的结果，而且最好能高效点
数组2是设置好的一些属性；数组1是商品可能只填写了某个或某几个属性

//数组1
Array
(
    [100008] => Array
        (
            [5] => Array
                (
                    [name] => 价格
                    [0] => 不限
                )

            [6] => Array
                (
                    [name] => 折扣
                    [0] => 不限
                )

        )

    [100009] => Array
        (
            [5] => Array
                (
                    [name] => 价格
                    [8] => 0-29
                )

            [6] => Array
                (
                    [name] => 折扣
                    [13] => 3-5折
                )
	   [7] => Array
                (
                    [name] => 出版社
                    [20] => 北京大学出版社
                )

        )

)

//数组2
Array
(
    [0] => Array
        (
            [attr_id] => 5
            [attr_name] => 价格
            [attr_value] => 0-29,30-49,50-99,100以上
        )

    [1] => Array
        (
            [attr_id] => 6
            [attr_name] => 折扣
            [attr_value] => 0-3折,3-5折,5-7折,7-10折
        )

    [2] => Array
        (
            [attr_id] => 7
            [attr_name] => 出版社
            [attr_value] =>
        )

)

//得到结果：数组3
Array
(
    [100008] => Array
        (
            [价格] => 不限
            [折扣] => 不限
            [出版社] => 
        )

    [100009] => Array
        (
            [价格] => 0-29
            [折扣] => 3-5折
            [出版社] => 北京大学出版社
        )

)

[php_way]

版主，牛....

[xuzuning]

$a = array (
  100008 => array (
    5 => array (
      'name' => '价格',
      0 => '不限',
    ),
    6 => array (
      'name' => '折扣',
      0 => '不限',
    ),
  ),
  100009 => array (
    5 => array (
      'name' => '价格',
      8 => '0-29',
    ),
    6 => array (
      'name' => '折扣',
      13 => '3-5折',
    ),
    7 => array (
      'name' => '出版社',
      20 => '北京大学出版社',
    ),
  ),
);

$b = array (
  0 => array (
    'attr_id' => '5',
    'attr_name' => '价格',
    'attr_value' => '0-29,30-49,50-99,100以上',
  ),
  1 => array (
    'attr_id' => '6',
    'attr_name' => '折扣',
    'attr_value' => '0-3折,3-5折,5-7折,7-10折',
  ),
  2 => array (
    'attr_id' => '7',
    'attr_name' => '出版社',
    'attr_value' => '',
  ),
);

foreach($a as $key=>$item) {
  $t = array();
  foreach($b as $v) {
    $k = $v['attr_id'];
    $t[$v['attr_name']] = isset($item[$k]) ? end($item[$k]) : $v['attr_value'];
  }
  $c[$key] = $t;
}
print_r($c);

Array
(
    [100008] => Array
        (
            [价格] => 不限
            [折扣] => 不限
            [出版社] => 
        )

    [100009] => Array
        (
            [价格] => 0-29
            [折扣] => 3-5折
            [出版社] => 北京大学出版社
        )

)