Question

我可以从mysql生成数组，如果有办法让它变得容易。我得到行，目前我正在渲染，如果有一种方法可以在飞行中生成

3,0.4311 | 3,0.1803 | 4,0.1149 | 4,0.0775 | 5,0.4291 | 5，0.5100 |

考虑这个数组，如何合并它：

Array
(
    [0] => Array
        (
            [channel_id] => 3
            [value] => 0.4311
        )

    [1] => Array
        (
            [channel_id] => 3
            [value] => 0.1803
        )

    [2] => Array
        (
            [channel_id] => 4
            [value] => 0.1149
        )

    [3] => Array
        (
            [channel_id] => 4
            [value] => 0.0775
        )

 ...
)

所以看起来像这样：

 Array
    (
        [0] => Array
            (
                [channel_id] => 3
                [value] => 0.4311
                [value] => 0.1803
            )

        [1] => Array
            (
                [channel_id] => 4
                [value] => 0.1149
                [value] => 0.0775

            )
   )

以下是我生成此数组的代码：

 while($row = $result->fetch_assoc()) {
        $array[] = array('channel_id'=>$row['channel_id'],'value'=>$row['value'] );
     }

Answer 1

好的，这似乎不可能，但这是关闭的我可以得到：

$channels_byid = array();
foreach($array as $v){
    @$channel = $channels_byid[$v['channel_id']];
    if ($array){
         if(!is_array($channel[0])){
             unset($channels_byid[$v['channel_id']]);
             $channels_byid[$v['channel_id']] = $channel;
         }
         $channels_byid[$v['channel_id']][] = $v;
    } else {
        $channels_byid[$v['channel_id']] = $v;
    }
} 
print_r($channels_byid);

哪个输出：

 [3] => Array
        (
            [0] => Array
                (
                    [channel_id] => 3
                    [value] => 0.7513
                )

            [1] => Array
                (
                    [channel_id] => 3
                    [value] => 0.7234
                )

        )

    [4] => Array
        (
            [0] => Array
                (
                    [channel_id] => 4
                    [value] => 0.9798
                )

            [1] => Array
                (
                    [channel_id] => 4
                    [value] => 0.7625
                )

        )

Answer 2

不完全是你所追求的，但它可能有用。 channel_id成为顶级键，value成为新数组的值。

$data[] = array('channel_id' => 3, 'value' => 0.4311);
$data[] = array('channel_id' => 3, 'value' => 0.1803);
$data[] = array('channel_id' => 4, 'value' => 0.1149);
$data[] = array('channel_id' => 4, 'value' => 0.0775);

foreach($data as $k => $v) {
    $merge[$v['channel_id']][] = $v['value'];
}

$merge的结果是：

array(2) {
  [3]=> array(2) {
        [0]=> float(0.4311)
        [1]=> float(0.1803)
  }
  [4]=> array(2) {
        [0]=> float(0.1149)
        [1]=> float(0.0775)
  }
}

如何按值合并数组

2 个答案: