PHP - 过滤数组以从子数组中删除具有不相似键的值

Question

我有一个如下所示的数组。这是来自一个集中式数据库，我无法事先知道实际数组将包含什么。我想比较键上的子数组，这就是为什么要删除不存在的键是所有子数组。

Array (
    [0] => Array
        (
            [a] => 
            [b] => 8
            [c] => 1
            [d] => taille-8
            [e] => 
            [k] => taill
        )

    [1] => Array
        (
            [a] => 
            [b] => 7
            [c] => 2
            [d] => taille-7
            [f] =>
            [k] => tafefef
        )

    [2] => Array
        (
            [a] => ce
            [b] => 34
            [c] => 2
            [d] => taille-34
            [g] => dee
            [k] => tacefef
        ) );

我想删除所有子数组中不重复的键。在上面的示例中，它们是“e”、“f”和“g”。这需要动态发生。

Array (
    [0] => Array
        (
            [a] => 
            [b] => 8
            [c] => 1
            [d] => taille-8
            [k] => taill
        )

    [1] => Array
        (
            [a] => 
            [b] => 7
            [c] => 2
            [d] => taille-7
            [k] => tafefef
        )

    [2] => Array
        (
            [a] => ce
            [b] => 34
            [c] => 2
            [d] => taille-34
            [k] => tacefef            
        ) );

任何建议表示赞赏。

Answer 1

您可以使用参数解包。如果您的数组存储在 $a 中，那么以下应该有效:

// create an array with only the keys that are common to all subarrays
$new = array_intersect_key(...$a);

// prune original array
foreach ($a as &$arr) {
    $arr = array_intersect_key($new, $arr);
}