php – 如何计算多维数组中的所有值？

我已经尝试过许多类似问题的解决方案,但它们似乎都给了我每个数组的计数.所以我有以下数组：

Array
(
    [1] => Array
        (
            [0] => 1
            [1] => 12
            [2] => 2
        )

    [2] => Array
        (
            [0] => 1
            [1] => 13
            [2] => 3
        )

    [3] => Array
        (
            [0] => 1
            [1] => 12
            [2] => 2
        )

    [4] => Array
        (
            [0] => 1
        )

    [5] => Array
        (
            [0] => 1
        )

)

我试图计算所有数组的重复项.所以输出应该显示：

Five 1's
Two 12's
One 13
Two 2's

目前我正在尝试：

foreach($data as $key => $row) {
    print_r(array_count_values($row));
}

其中输出每个单独阵列的计数

Array
(
    [1] => 1
    [12] => 1
    [2] => 1
)
Array
(
    [1] => 1
    [13] => 1
    [3] => 1
)
Array
(
    [1] => 1
    [12] => 1
    [2] => 1
)
Array
(
    [1] => 1
)
Array
(
    [1] => 1
)

我也试过这个：

foreach ($data as $key => $row) {
    $counts = array_count_values(array_column($data, $key));
    var_dump($counts);
}

这似乎错过了很多信息,比如1的计数

array(2) {
  [12]=>
  int(2)
  [13]=>
  int(1)
}
array(2) {
  [2]=>
  int(2)
  [3]=>
  int(1)
}
array(0) {
}
array(0) {
}
array(0) {
}

注意,初始数组键并不总是顺序的,因为它代表行号.所以这个数组可能包含行1,2,5,6,7等.

我将如何计算所有重复项？

解决方法:

由于您的数组未展平,因此除非要调用合并函数,否则需要访问每个值并增加.

代码：(Demo)

$array = [
    1 => [1, 12, 2],
    2 => [1, 13, 3],
    3 => [1, 12, 2],
    4 => [1],
    5 => [1]
];

//           make the generated value available outside of function scope
//           \-------------------------------v--------------------------/
array_walk_recursive($array, function($v)use(&$output) {  // visit each leafnode
    if (isset($output[$v])) {  // check if the key has occurred before
        ++$output[$v];         // increment
    } else {
        $output[$v] = 1;       // declare as 1 on first occurrence
    }
});

var_export($output);

输出：

array (
  1 => 5,
  12 => 2,
  2 => 2,
  13 => 1,
  3 => 1,
)

或者,非递归：

foreach ($array as $row) {
    foreach ($row as $v) {
        if (isset($output[$v])) { // check if the key has occurred before
            ++$output[$v];        // increment
        } else {
            $output[$v] = 1;      // declare as 1 on first occurrence
        }
    }
}

或者,一个功能性的单线,以平坦然后计数：

var_export(array_count_values(array_reduce($array, 'array_merge', array())));

或者,带有splat运算符的功能性单行程平坦然后计数：

var_export(array_count_values(array_merge(...$array)));