php数组处理的疑惑

foreach ($good_info as $key => &$val) {

    $val['g_num'] = $vv[$key];

    $val['ware_Beizu'] = $bb[$key];

}

[7]=>

  array(15) {

    ["id"]=>

    string(4) "1170"

    ["g_name"]=>

    string(12) "日本豆腐"

    ["g_images"]=>

    string(72) "http://xlddc.zkd.com/Public/Uploads/goods/2017-06-29/595450d5db86a.jpg"

    ["g_price"]=>

    string(1) "0"

    ["g_attr"]=>

    string(7) "90g/根"

    ["g_cd"]=>

    string(6) "中国"

    ["g_desc"]=>

    string(0) ""

    ["g_count"]=>

    string(3) "998"

    ["g_sum"]=>

    string(1) "1"

    ["g_cat"]=>

    string(3) "878"

    ["is_on_sale"]=>

    string(1) "1"

    ["g_sn"]=>

    string(5) "13033"

    ["g_cont"]=>

    NULL

    ["g_num"]=>

    string(1) "1"

    ["ware_Beizu"]=>

    string(12) "日本豆腐"

  }

  [8]=>

  &array(15) {

    ["id"]=>

    string(4) "1175"

    ["g_name"]=>

    string(9) "咸鸭蛋"

    ["g_images"]=>

    string(72) "http://xlddc.zkd.com/Public/Uploads/goods/2017-06-29/595456e6e0c73.jpg"

    ["g_price"]=>

    string(1) "0"

    ["g_attr"]=>

    string(3) "只"

    ["g_cd"]=>

    string(6) "中国"

    ["g_desc"]=>

    string(0) ""

    ["g_count"]=>

    string(3) "997"

    ["g_sum"]=>

    string(1) "2"

    ["g_cat"]=>

    string(3) "879"

    ["is_on_sale"]=>

    string(1) "1"

    ["g_sn"]=>

    string(10) "0401002002"

    ["g_cont"]=>

    NULL

    ["g_num"]=>

    string(1) "1"

    ["ware_Beizu"]=>

    string(9) "咸鸭蛋"

  }

}