php数组重新排序和合并排序答案

【问题标题】：php arrays rearaging and merging and sortingphp数组重新排序和合并排序
【发布时间】：2015-11-23 21:38:17
【问题描述】：

所以我有一个数组：

Array
(
    [0] => Array
        (
            [observationdate] => 2015-10-30
            [country] => US
            [town] => Coventry
        )

    [1] => Array
        (
            [observationdate] => 2015-10-01
            [country] => US
            [town] => York
        )

    [2] => Array
        (
            [observationdate] => 2015-10-02
            [country] => US
            [town] => York
        )

    [3] => Array
        (
            [observationdate] => 2015-10-02
            [country] => US
            [town] => York
        )

    [4] => Array
        (
            [observationdate] => 2015-10-10
            [country] => US
            [town] => York
        )

    [5] => Array
        (
            [observationdate] => 2015-10-30
            [country] => US
            [town] => York
        )

)

我想这样排序：

   Observation date ex 2015-10-30
     Town = Conventry
                [observationdate] => 2015-10-30
                [country] => US
                [town] => Coventry
     Town = York
                  [observationdate] => 2015-10-30
                  [country] => US
                  [town] => York


   Observation date ex 2015-10-02
       Town = York
                  [observationdate] => 2015-10-02
                  [country] => US
                  [town] => York

第一部分是重新排列

foreach($arraything as $item) {
    $items[$item['observationdate']][] = $item;

}

效果很好：

我得到一个按日期排列的数组：

Array
(
[2015-10-30] => Array
    (
        [0] => Array
            (
                [observationdate] => 2015-10-30
                [country] => US
                [town] => Coventry
            )

        [1] => Array
            (
                [observationdate] => 2015-10-30
                [country] => US
                [town] => York
            )

    )

[2015-10-01] => Array
    (
        [0] => Array
            (
                [observationdate] => 2015-10-01
                [country] => US
                [town] => York
            )

    )

[2015-10-02] => Array
    (
        [0] => Array
            (
                [observationdate] => 2015-10-02
                [country] => US
                [town] => York
            )

        [1] => Array
            (
                [observationdate] => 2015-10-02
                [country] => US
                [town] => York
            )

    )

[2015-10-10] => Array
    (
        [0] => Array
            (
                [observationdate] => 2015-10-10
                [country] => US
                [town] => York
            )

    )

)

现在在按日期排列的数组中，我需要按城镇排列

foreach($items AS $catid => $cat_items) {
    echo '<h3>'.$catid.'</h3>';
      foreach($cat_items AS $itema) {
      $itemsa[$itema['town']][] = $itema;
}
        echo "<pre>";
        print_r($itemsa);
        echo "</pre>";

}

现在开始我的问题，因为这里是每个，每次它都添加到我的新数组中

2015-10-30
Array
(
    [Coventry] => Array
        (
            [0] => Array
                (
                    [observationdate] => 2015-10-30
                    [country] => US
                    [town] => Coventry
                )

        )

    [York] => Array
        (
            [0] => Array
                (
                    [observationdate] => 2015-10-30
                    [country] => US
                    [town] => York
                )

        )

)

到日期

2015-10-10
Array
(
    [Coventry] => Array
        (
            [0] => Array
                (
                    [observationdate] => 2015-10-30
                    [country] => US
                    [town] => Coventry
                )

        )

    [York] => Array
        (
            [0] => Array
                (
                    [observationdate] => 2015-10-30
                    [country] => US
                    [town] => York
                )

            [1] => Array
                (
                    [observationdate] => 2015-10-01
                    [country] => US
                    [town] => York
                )

            [2] => Array
                (
                    [observationdate] => 2015-10-02
                    [country] => US
                    [town] => York
                )

            [3] => Array
                (
                    [observationdate] => 2015-10-02
                    [country] => US
                    [town] => York
                )

            [4] => Array
                (
                    [observationdate] => 2015-10-10
                    [country] => US
                    [town] => York
                )

        )

)

我将所有条目添加到我的新数组中。

如何阻止？

【问题讨论】：

标签： php arrays sorting

【解决方案1】：

将您的代码更改为此并尝试...

foreach($arraything as $item) {
    $items[$item['observationdate']][$item['town']][] = $item;
}

无需循环两次。

【讨论】：