Question

第一个数组如下所示：

Array
(
    [0] => Array
        (
            [employee_id] => 100
            [year] => 2014
            [month] => 7
            [amount] => 16.00
            [employee_name] => John
        )

    [1] => Array
        (
            [employee_id] => 100
            [year] => 2014
            [month] => 6
            [amount] => 2.00
            [employee_name] => John
        )

    [2] => Array
        (
            [employee_id] => 573
            [year] => 2014
            [month] => 7
            [amount] => 10.00
            [employee_name] => Bill
        )
)

我想创建一个这样的数组：

Array
(
    [0] => Array
        (
            [employee_id] => 100
            [year] => 2014
            [amount_month7] => 16.00
            [amount_month6] => 2.00
            [employee_name] => John
        )

    [1] => Array
        (
            [employee_id] => 573
            [year] => 2014
            [amount_month7] => 10.00
            [amount_month6] => 0.00
            [employee_name] => Bill
        )
)

因此，每个月的金额总计为每个员工。

现在我确实成功地使用了很多ifs和elseifs，但我不知道用foreach语句做这个可能会更好，但是我找不到根据其他值对值进行求和的方法。声明应该是

foreach 
if (employee_id, year and month) is the same, amount_month[month] += amount

使用foreach有一种简单的方法吗？

Answer 1

$values = array_unique(array_map(
    function ($v) { return $v['employee_id']; },
    $array
));

$result = array();
foreach ($values as $val) {
    $result[] = array_filter($array, function ($v) use ($val) {
        return $v['employee_id'] == $val;
    });
}

Answer 2

如果您通过PHP而不是通过SQL进行此重组，则可能更容易创建如下数组：

Array
(
    [0] => Array
        (
            [employee_id] => 100
            [year] => 2014
            [amounts] => Array
              (
                [6] => 2.00
                [7] => 16.00
              )
            [employee_name] => John
        )

    [1] => Array
        (
            [employee_id] => 573
            [year] => 2014
            [amounts] => Array
              (
                [7] => 10.00
              )
            [employee_name] => Bill
        )
)

在第一个数组where子句中创建具有值总和的数组

2 个答案: