Question

我有一个这样的数组：

array(5) {
         ["Uniform"]=>
      array(2) {
        [0]=>
        array(2) {
          ["invoice_pname"]=>
          string(7) "Uniform"
          ["amount"]=>
          string(3) "900"
        }
        [1]=>
        array(2) {
          ["invoice_pname"]=>
          string(7) "Uniform"
          ["amount"]=>
          string(3) "450"
        }
      }

      ["Tuition Fee"]=>
      array(2) {
        [0]=>
        array(2) {
          ["invoice_pname"]=>
          string(11) "Tuition Fee"
          ["amount"]=>
          string(3) "300"
        }
        [1]=>
        array(2) {
          ["invoice_pname"]=>
          string(11) "Tuition Fee"
          ["amount"]=>
          string(3) "300"
        }
      }
    }

我想在关键元素中添加数组值，例如：

Uniform =＆gt; 1350

学费=＆gt; 600

我所做的是使用foreach作为循环，

 $results = array();
 foreach ($result as $key => $resultant) {
    foreach ($resultant as $value) {
          $results[$key][] += $value['amount'];  
     }
  }

  var_dump($results);

但它显示错误

<h4>A PHP Error was encountered</h4>
<p>Severity: Notice</p>
<p>Message:  Undefined index: Uniform</p>
<p>Filename: controllers/Home.php</p>
<p>Line Number: 2787</p>
<p>Backtrace:</p>

任何人都可以帮助我吗？我想把它放在一张桌子里。

Answer 1

查看您的数据，您应该迭代结果[＆＃39; Uniform＆＃39;]

$results = array();
  foreach ($result['Uniform'] as $key => $resultant) {
     foreach ($resultant as $value) {
        $results[$key][] += $value['amount'];  
     }
  }

因为看起来这个键是包含sum

的有效数组的键

Answer 2

您可以使用array_column和array_sum 这样你就不需要循环整个数组了。

Foreach($arr as $key => $a){
    $res[$key] = array_sum(array_column($a, "amount"));
}
Var_dump($res);

https://3v4l.org/Wba3Q

在PHP中循环并求和数组值

2 个答案: