php数组的重新排列、合并和排序 - php arrays rearaging and merging and sorting

php arrays rearaging and merging and sorting

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

第一部分是重新设置

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

哪一个很好：

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阵列中，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>";
}

现在从这里开始我的问题，因为这里是每个，每次它添加到我的新数组

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。

如何阻止这种情况？

将您的代码更改为这个并尝试。。。

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

不需要循环两次。