如何将数组转换为多维答案

【问题标题】：how to convert an array into multidimensional如何将数组转换为多维
【发布时间】：2016-05-14 11:20:36
【问题描述】：

我有一个要转换为多维的数组。

这是数组

Array
(
    [0] => Array
        (
            [packageid] => FGF1460676803
            [uniqueid] => uid1460676987
            [hotelname] => Jet Park Airport
            [Country] => New Zealand
        )

    [1] => Array
        (
            [packageid] => FGF1460678556
            [uniqueid] => uid1460678681
            [hotelname] => Mercure Windsor
            [Country] => New Zealand
        )

    [2] => Array
        (
            [packageid] => FGF1460678556
            [uniqueid] => uid1460678787
            [hotelname] => Jet Park Airport
            [Country] => New Zealand
        )
)

我已经尝试过这段代码，但它没有显示我想要的。从 mysql 的两个表中获取的这个数组第一个是携带 packageid，第二个是携带 uniqueid、hotelname、country 所以我加入它但我想加入下面的数组但我被困在如何使用 mysql 或获取数组之后。

这是 mysql 查询

SELECT
    c.packageid,
    `uniqueid`,
    `hotelname`,
    `Country`
FROM
    custinfo c,
    hotelcarttemp h
WHERE
    c.packageid = h.packageid

PHP 代码

foreach ($json_decode_array1 as $row)
{
   $newArray[$row['packageid']][] = $row;
}

echo '<pre>'; print_r($newArray); echo '</pre>';

想要输出

Array
(
    [0] => Array
        (   
            [packageid] => FGF1460676803
            [hoteldata] => Array
                    (
                        [0] => Array
                            (
                                [uniqueid] => uid1460676987
                                [hotelname] => Jet Park Airport
                                [Country] => New Zealand
                            )
                    )
        )

    [1] => Array
        (   
            [packageid] => FGF1460678556
            [hoteldata] => Array
                    (
                        [0] => Array
                            (
                                [uniqueid] => uid1460678681
                                [hotelname] => Mercure Windsor
                                [Country] => New Zealand
                            )

                        [1] => Array
                            (
                                [uniqueid] => uid1460678787
                                [hotelname] => Jet Park Airport
                                [Country] => New Zealand
                            )
                    )
        )
)

【问题讨论】：

标签： php mysql arrays multidimensional-array

【解决方案1】：

试试这个：

$newArray = array();
foreach ($json_decode_array1 as $row)
{
    $pid = $row['packageid'];
    if (!isset($newArray[$pid])) {
        $newArray[$pid] = array(
            'packageid' => $pid,
            'hoteldata' => array(),
        );
    }
    // if you don't want `packageid` 
    // to present in a arrays of `hoteldata`
    // you can `unset` this key:
    unset($row['packageid']);

    $newArray[$pid]['hoteldata'][] = $row;
}

// use array_values to turn array keys to numeric:
$newArray = array_values($newArray);

【讨论】：

$newArray[$pid]['hoteldata'] = $row; 这将覆盖 array() 而不是推送$row。
@u_mulder 非常感谢您的回答，但它显示的输出类似于 Link
@VijayKumar 修正了我的答案：在 $newArray[$pid] = array() 中删除了 []
@u_mulder 你真的需要在第 8 行设置 'hoteldata' => array()。这是否必要，因为你最终创建了那个键？
@PetkoKostov 没必要，但我想知道我在这里有什么。

【解决方案2】：

试试这个

$newArr = array();
    foreach($json_decode_array1 as $row) {
        $temp = array();
        $temp['packageid'] = $row['packageid'];
        $temp['hoteldata'] = array(
            'uniqueid' => $row['uniqueid'],
            'hotelname' => $row['hotelname'],
            'Country' => $row['Country'],
        );
        $newArr[] = $temp;
    }
    echo '<pre>';print_r($newArr);

【讨论】：

【解决方案3】：

使用array_walk、array_shift和array_values函数的解决方案：

$result = [];
array_walk($arr, function($v) use(&$result) {   // $arr is your initial array
    $packageid = array_shift($v);
    if (!isset($result[$packageid])) {
        $result[$packageid] = ["packageid" => $packageid, "hoteldata" => [$v]];
    } else {
        $result[$packageid]["hoteldata"][] = $v;
    }    
});

print_r(array_values($result));

输出：

Array
(
    [0] => Array
        (
            [packageid] => FGF1460676803
            [hoteldata] => Array
                (
                    [0] => Array
                        (
                            [uniqueid] => uid1460676987
                            [hotelname] => Jet Park Airport
                            [Country] => New Zealand
                        )
                )
        )
    [1] => Array
        (
            [packageid] => FGF1460678556
            [hoteldata] => Array
                (
                    [0] => Array
                        (
                            [uniqueid] => uid1460678681
                            [hotelname] => Mercure Windsor
                            [Country] => New Zealand
                        )
                    [1] => Array
                        (
                            [uniqueid] => uid1460678787
                            [hotelname] => Jet Park Airport
                            [Country] => New Zealand
                        )
                )
        )
)

【讨论】：