PHP 多维数组中具有相同元素的数组中的值相乘

Question

谁能解释一下如何乘以这段代码的值？我试过了，但仍然无法解决这个问题

arrayK(
     0 => array(
          'name'=> AA,
          'value' => 2.00,
          ),
     1 => array(
          'name' => AA,
          'value' => 1.82,
          ),
     2 => array(
          'name' => BB,
          'value' => 2.20,
          ),
    3 => array(
          'name' => AA,
          'value' => 4.20,
          ),
    4 => array(
          'name' => BB,
          'value' => 4.20,
          ),
    );

答案应该返回到数组，其值已经乘以具有相同名称的地方

newArray(
     0 => array(
            'name'=> AA,
            'value' => ...,
          ),
     1 => array(
            'name' => BB,
            'value' => ....,
          ),
);

Answer 1

要乘以重复值并得到新数组：

$array=array(
  0 => array(
       'name'=> AA,
       'value' => 2.00,
       ),
  1 => array(
       'name' => AA,
       'value' => 1.82,
       ),
  2 => array(
       'name' => BB,
       'value' => 2.20,
       ),
 3 => array(
       'name' => AA,
       'value' => 4.20,
       ),
 4 => array(
       'name' => BB,
       'value' => 4.20,
       ),
    );

  $result = array();
  foreach ($array as $val) {
      if (!isset($result[$val['name']]))
          $result[$val['name']] = $val;
      else
          $result[$val['name']]['value'] *= $val['value'];
  }
  $result = array_values($result); // reindex array
  echo "<pre>";
  print_r($result);

Answer 2

您可以尝试以下解决方案。

$arrayK = array(
0 => array(
    'name'=> "AA",
    'value' => 2.00,
),
1 => array(
    'name' => "AA",
    'value' => 1.82,
),
2 => array(
    'name' => "BB",
    'value' => 2.20,
),
3 => array(
    'name' => "AA",
    'value' => 4.20,
),
4 => array(
    'name' => "BB",
    'value' => 4.20,
),
);

$temp = array_values((array_unique(array_column($arrayK, 'name'))));

$arrayY = [];
for( $i = 0; $i < count($temp); $i++ ) {
    foreach( $arrayK as $key => $val ) {
        if( $val['name'] == $temp[$i] ) {
            $arrayY[$i] = [
                'name' => $val['name'],
                'value' => isset($arrayY[$i]['value']) ? $val['value'] * $arrayY[$i]['value'] : $val['value']
            ];
        }
    }
}
print_r($arrayY);

输出

Array
(
    [0] => Array
        (
            [name] => AA
            [value] => 15.288
        )

    [1] => Array
        (
            [name] => BB
            [value] => 9.24
        )

)

你可以玩代码Here

PHP 多维数组中具有相同元素的数组中的值相乘

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