Question

我有一个多维数组，我试图用一个值组合键。

所以

 Array (
[0] => Array  (
        [name] => Edward Foo
        [desc_topic] => Array (
                         [0] => Apple
                         [1] => Banana
                         [2] => Orange
                        )            
        [qtd_posts] => Array  (
                         [0] => 10
                         [1] => 20
                         [2] => 50
                        )

    )


[1] => Array  (
        [name] => Michael Max
        [desc_topic] => Array (
                         [0] => Apple
                         [1] => Banana
                         [2] => Orange
                        )  
        [qtd_posts] => Array  (
                         [0] => 10
                         [1] => 10
                         [2] => 10
                        )
    )

[2] => Array  (
        [name] => Edward Foo
        [desc_topic] => Array (
                         [0] => Apple
                         [1] => Banana
                         [2] => Orange
                        )            
        [qtd_posts] => Array  (
                         [0] => 5
                         [1] => 10
                         [2] => 30
                        )

    )

[3] => Array  (
        [name] => Michael Max
        [desc_topic] => Array (
                         [0] => Apple
                         [1] => Banana
                         [2] => Orange
                        )             
        [qtd_posts] => Array  (
                         [0] => 8
                         [1] => 8
                         [2] => 20
                        )

    )

我真的需要：

Array (
[0] => Array  (
        [name] => Edward Foo
        [desc_topic] => Array (
                         [0] => Apple
                         [1] => Banana
                         [2] => Orange
                        )            
        [qtd_posts] => Array  (
                         [0] => 15
                         [1] => 30
                         [2] => 80
                        )

    )

[1] => Array  (
        [name] => Michael Max
        [desc_topic] => Array (
                         [0] => Apple
                         [1] => Banana
                         [2] => Orange
                        )  
        [qtd_posts] => Array  (
                         [0] => 18
                         [1] => 18
                         [2] => 30
                        )

           )

  )

Answer 1

我假设以下内容：

原始数组中的每个名称条目都有一个相同的desc_topic子数组（例如，它们对于每个实例都具有相同的Apple / Banana / Orange值。
qtd_posts子阵列在相同的对应槽中具有待分组的值（例如，所有'1'条目将被加在一起，所有'2'条目被加在一起等等... ）
您希望保留父数组键，以便所有'Edward Foo'条目将使用Edward Foo条目使用的第一个键（例如0）

如果适用，那么这样的事情应该有效：

$newarr = array();
$reverse_map = array();

foreach($array as $idx => $entry) {
    if (isset($reverse_map[$entry['name']]) {
         // have we seen this name before? retrieve its original index value
         $idx = $reverse_map[$entry['name']]; 
    } else {
         // nope, new name, so store its index value
         $reverse_map[$entry['name']] = $idx;
    }

    // copy the 'constant' values
    $newarr[$idx]['name'] = $entry['name'];
    $newarr[$idx]['desc_top'] = $entry['desc_topic'];

    // sum the qtd_post values to whatever we previously stored.        
    foreach($entry['qtd_posts'] as $x => $y) {
        $newarr[$idx]['qtd_posts'][$x] += $y;
    }
}

如何通过键对多维ARRAY进行SUM和GROUP BY？

1 个答案: