如何在一个多维数组中组合内部数组值？

Question

您好，我有一个多维数组，我使用 mysql PDO 检索数据并以这种方式格式化

array('id'=>$row['empname'],'data'=>array(array($row['salestat'],$row['salecount'])))

Array
(
[0] => Array
    (           
        [id] => 'employee1'
        [data] => Array
             (
              0 => 'Sold'
              1 => 1
             )
    )

[1] => Array
    (            
        [id] => 'employee2'
        [data] => Array
             (
              0 => 'On Process'
              1 => 4
             )
    )

[2] => Array
    (            
        [id] => 'employee2'
        [data] => Array
             (
              0 => 'Sold'
              1 => 2
             )
    )
)

我正在尝试制作这样的输出，尝试对其进行格式化，以便我可以将其用于 highcharts 中的 drilldown 系列，谢谢

Array
(
[0] => Array
    (           
        [id] => 'employee1'
        [data] => Array
             (
              0 => 'Sold'
              1 => 1
             )
    )

[1] => Array
    (            
        [id] => 'employee2'
        [data] => Array
           [0]
             (
              0 => 'On Process'
              1 => 4
             )
           [1]
             (
              0 => 'Sold'
              1 => 2
             )
    )
)

Answer 1

首先，您不能使用相同的键（如salescount 或salestat）两次使用数组中的字段。但是你可以这样做。

function wrapSameId( $employeeArray ) {

    //create the new array.
    $newEmployeeArray = array();

    //loop the old array.
    foreach ($employeeArray as $key => $value) {
        $exists = 0;
        $i=0;

        $id = $value['id'];
        $data = $value['data'];

        //see if you can find the current id inside the newly created array if you do, only push the new data in.
        foreach ($newEmployeeArray as $key2 => $value2) {
            if( $id == $value2['id'] ) { $newEmployeeArray[$key2]['data'][] = $data;$exists = 1;var_dump($value2['data']); }
            $i++;
        }

        //if we didnt find the id inside the newly created array, we push the id and the new data inside it now.
        if( $exists == 0 ){
            $newEmployeeArray[$i]['id'] = $id;
            $newEmployeeArray[$i]['data'][] = $data; 
        }
    }   

    return $newEmployeeArray;

}

这个函数应该返回一个新数组，但是如果在旧数组中有多个具有相同 id 的数组，我们应该在这个数组中：

Array
(
    [0] => Array
        (
            [id] => employee1
            [data] => Array
                (
                    [0] => Array
                        (
                            [salescount] => 4
                            [salesstat] => Sold
                        )

                )

        )

    [1] => Array
        (
            [id] => employee2
            [data] => Array
                (
                    [0] => Array
                        (
                            [salescount] => 2
                            [salesstat] => In Progress
                        )

                    [1] => Array
                        (
                            [salescount] => 5
                            [salesstat] => Sold
                        )

                )

        )

)

你可以这样使用它：

$employees = wrapSameId( $PDOArray );

$PDOArray 是您的初始数组。希望这就是您想要的。

Answer 2

为什么不按id索引你的输出数组？

遍历您的初始数组并将 salecount、salestat 对添加到员工的数据数组中。

$outputArray = array();

//Loop over each entry pulled from you database...
foreach ($employeeArray as $employeeInfo)
{
    //If no index for the current employee exists, create an empty array
    //The only reason I'm including this is because I'm not sure how array_merge handles nulls -- just to be safe
    if (!$outputArray[$employeeInfo['id']])
    {
        $outputArray[$employeeInfo['id']] = array();
    }

    //Merge the existing array for that employee with the new data for the same employee
    $outputArray[$employeeInfo['id']] = array_merge($outputArray[$employeeInfo['id']], $employeeInfo['data']);
}

print_r($outputArray);

更容易可视化输出...

Array
(
[employee1] => Array
            (           
                 0 => 1
                 1 => 'Sold'
            )

[employee2] => Array
            (            
                 0 => 4
                 1 => 'On Process'
                 2 => 2
                 3 => 'Sold'
            )
)

如果您对按 id 索引的输出不满意，请再次循环并根据需要设置格式。

$otherOutputArray = array();
foreach ($outputArray as $key => $value)
{
    $otherOutputArray[] = array('id' => $key, 'data' => $value);
}

这正是你想要的。