Question

我经常搜索这个问题。但我无法在任何地方找到合适的解决方案。就像你为一维数组做一个array_count_values()一样，如果你想要一个类似的解决方案，你会对多维数组做什么？

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？

Answer 1

对数组使用变量$arr，您可以这样做：

$out = array();
foreach ($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：

$out = array();
foreach ($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
        )

)

Answer 2

<?php
  $array = array(array('07/11' => '134'), array('07/11' => '134'), array('07/12' => '145'));
  $count = array();
  foreach ($array as $val) {
    foreach ($val as $key => $subval) {
      $count[$key]++;
    }
  }
  print_r($count);

Answer 3

在你的位置我会改变数据数组的结构。在你的情况下：

Array( 
    [07/11] => Array
        (
            [0] => 134,
            [1] => 134,
            [2] => 145,
            [3] => 145,
            ...
        )
)

Answer 4

聪明的方法，我们知道array_count_values()：计算数组的所有值

<块引用>

就像您对一维数组执行 array_count_values() 一样，您对多维数组执行什么操作。

我们把它变成一维数组，然后我们调用函数

$input = array(
    array('07/11' => '134'),
    array('07/11' => '134'), 
    array('07/11' => '145'),
    array('07/11' => '145'),
    array('07/12' => '134'), 
    array('07/12' => '99')
    );
$output = [];
foreach ($input as $inner){
    foreach ($inner as $key => $value){
        $output[] = "Date: $key, ID: $value, Count:";
    }
}

输出：如您所料

foreach(array_count_values($output) as $key => $value) {
    echo "$key $value<br>";
}

/*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*/

array_count_values的多维数组？

4 个答案: