在多维数组中的子数组之间寻找公共值 [英] Finding common value among sub-arrays in a multidimensional array

问题描述

我有以下数组:

Array
(
    [0] => Array
        (
            [0] => 87
            [1] => 58
            [2] => 85
            [3] => 86
        )

    [1] => Array
        (
            [0] => 58
            [1] => 84
        )

    [2] => Array
        (
            [0] => 58
        )

)

上面的这个数组是一个例子.实际的数组大小可变，但结构如下.基本上，我想在每个二级数组上运行 array_intersect 并获取它们之间共有的值(数字).在这种情况下，它将是 58.

This array above is an example. The actual array is of variable size, but structured like this. Basically, I'd like to run array_intersect on each second level array and grab the value (number) that is common between them. In this case, it would be 58.

我不太确定从哪里开始.有什么建议吗?

I'm not quite sure where to start on this. Any advice?

推荐答案

这对我有用:

function multi_intersect($arr) {
   $return = array();
   foreach ($arr as $a) {
       foreach ($arr as $b) {
           if ($a === $b) continue;
           $return = array_merge($return, array_intersect($a, $b));
       }
   }
   return array_unique($return);
}

应该让你:

Array
(
    [0] => 58
)

如果您在至少两个子数组中有一个公共数字，则上述方法将起作用.

The above will work if you have a common number in at least two of the sub-arrays.

编辑后:

如果你想找到包含在所有子数组中的数字，你可以简单地在 array_intersect 上使用 call_user_func_array:

You can simply use call_user_func_array on array_intersect, if you want to find numbers that are contained in all sub-arrays:

$intersect = call_user_func_array('array_intersect', $arr);

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