带有循环的PHP多维关联数组

Question

我想构建一个多维关联数组，但第一个数组是空的。正如你可以看到[domain1]数组没有显示任何关联数组项，而[domain2]正在显示应该在[domain1]数组中的结果。

foreach ($db->query($sql) as $row) { 
      $arr1['domain'.$x] = $arr2; 
      $arr2['sum'] = $row['domain' . $x]; 
      $arr2['core'] = ${"d$x"}; 
     } 

我的结果看起来像这样。

Array 
(
[domain1] => Array 
    (
    ) 

[domain2] => Array 
    (
     [sum] => 8 
     [core] => 4 
    ) 

[domain3] => Array 
    (
     [sum] => 8 
     [core] => 3 
    ) 

[domain4] => Array 
    (
     [sum] => 8 
     [core] => 2 
    ) 

[domain5] => Array 
    (
     [sum] => 8 
     [core] => 3 
    ) 

[domain6] => Array 
    (
     [sum] => 8 
     [core] => 6 
    ) 
) 

Answer 1

您以错误的顺序设置数组$arr1。正确的顺序是：

foreach ($db->query($sql) as $row) { 
    $arr2 = array(); 
    $arr2['sum'] = $row['domain' . $x]; 
    $arr2['core'] = ${"d$x"}; 
    $arr1['domain'.$x] = $arr2; 
}