如果数组中出现空值，则将零添加到数组 [英] Adding zero to an array if empty values occurs in array

问题描述

这是在按日期为每个产品组选择总和（金额）之后得到的数组。
当日期没有对应的金额时显示为空。我需要将其显示为零。

This is the array which I am getting after selecting sum(amounts) for each products group by date. when the dates did not having correspondent amount it is displaying as empty.I need to display it as zero.

Array
(
    [2019-05-16] => Array
        (
            [0] => 499
        )

    [2019-05-17] => Array
        (
            [0] => 1998
        )

    [2019-05-18] => Array
        (
            [0] => 195
        )

    [2019-05-19] => Array
        (
            [0] => 1194
            [1] => 999
        )

)

但是输出应该是这样，

有没有办法将空值设为0

Is there any way to make empty values as 0

Array
(
    [2019-05-16] => Array
        (
            [0] => 499
            [1] => 0

        )

    [2019-05-17] => Array
        (
            [0] => 1998
           [1] => 0
        )

    [2019-05-18] => Array
        (
            [0] => 195
            [1] => 0
        )

    [2019-05-19] => Array
        (
            [0] => 1194
            [1] => 999
        )

)

这是脚本

foreach ($productid as $itemid) {

  $query1 = "select date, SUM(amount) as amount from app_product_details where  date between '2019-05-14 00:00:00' and '2019-05-20 23:59:59' and appid = $itemid group by date";

        $getquery1 = mysqli_query($conn,$query1);
        while($getcount1 = mysqli_fetch_assoc($getquery1))
        {

          $grset1[] = $getcount1;

        }
      }

 foreach($grset1 as $r){
$dates1[$r['date']][] = $r['amount'];

}

请帮助我获得输出。

推荐答案

您可以更改查询，以在没有指定产品的情况下返回0值，而不是尝试破解数组当天卖出。这应该起作用：

Rather than trying to hack your array, you can change your query so that it returns a 0 value when there were none of a given product sold on that day. This should work:

$query1 = "SELECT date, SUM(CASE WHEN appid = $itemid THEN amount ELSE 0 END) AS amount 
           FROM app_product_details
           WHERE date BETWEEN '2019-05-14 00:00:00' AND '2019-05-20 23:59:59' 
           GROUP BY date";

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