多维数组的array_count_values? [英] array_count_values of a multi dimensional array?

问题描述

我已经搜索了很多这个问题.但是我在任何地方都找不到合适的解决方案.就像您对一维数组执行array_count_values()一样，如果想要类似类型的解决方案，对多维数组怎么办?

I have searched this question a lot. But I could not find a proper solution anywhere. Just like you do an array_count_values() for a single dimensional array, what do you do for a multi dimensional array if you want similar type of a solution?

例如-

Array
(
    [0] => Array
        (
            [07/11] => 134
        )

    [1] => Array
        (
            [07/11] => 134
        )

    [2] => Array
        (
            [07/11] => 145
        )

    [3] => Array
        (
            [07/11] => 145
        )

    [4] => Array
        (
            [07/12] => 134
        )

    [5] => Array
        (
            [07/12] => 99
        )
)

我想要的输出是-

Date: 07/11, ID: 134, Count: 2
Date: 07/11, ID: 145, Count: 2
Date: 07/12, ID: 135, Count: 1
Date: 07/12, ID: 99, Count: 1

我该怎么做?

推荐答案

为数组使用变量$arr，您可以这样做:

Using the variable $arr for your array, you could do this:

$out = array();
foreach ($arr as $key => $value){
    foreach ($value as $key2 => $value2){
        $index = $key2.'-'.$value2;
        if (array_key_exists($index, $out)){
            $out[$index]++;
        } else {
            $out[$index] = 1;
        }
    }
}
var_dump($out);

输出:

Array
(
    [07/11-134] => 2
    [07/11-145] => 2
    [07/12-134] => 1
    [07/12-99] => 1
)

这是另一个将其生成为多维数组的版本:

Here's another version that produces it as a multidimensional array:

$out = array();
foreach ($arr as $key => $value){
    foreach ($value as $key2 => $value2){
        if (array_key_exists($key2, $out) && array_key_exists($value2, $out[$key2])){
            $out[$key2][$value2]++;
        } else {
            $out[$key2][$value2] = 1;
        }
    }
}

输出:

Array
(
    [07/11] => Array
        (
            [134] => 2
            [145] => 2
        )

    [07/12] => Array
        (
            [134] => 1
            [99] => 1
        )

)

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