Question

我想从php顺序/索引，assoc和多维数组中获取最多和最少出现的值

考虑以下数据集

        $dataSet = [
            'users' => 
            [
                'id' => 1,
                'name' => "Alex",
                'username' => 'alex',
            ],
            [
                'id' => 2,
                'name' => "Alex",
                'username' => 'alex'
            ],
            [
                'id' => 2,
                'name' => "Peter Khot",
                'username' => 'peter',
            ]
        ];

上面是示例数据集

这是我尝试过的

    function most_occurring(array $array, $key)
    {
        $dataSet = [];
        $i = 0;
        $keys = [];
        foreach ($array as $k) {
            if (in_array($k[$key], $keys)) {
                $keys[$i] = $k[$key];
                $dataSet[$i] = $k;
            } 

            $i++;
        }

        return $dataSet;
    }

我在上面的代码中尝试了大多数出现的值，但根本没有用，可以帮助我处理数组中出现最多和最少的值。谢谢

Answer 1

由于使用KIKO软件，在这种情况下您仍然可以使用array_count_values()。在这种情况下，您还需要使用array_columns()和array_search()。您可以参考此link来了解array_search（）如何帮助您找到数组中的最大/最小值及其对应的键。要查找最多或最少的事件，只需回显我在最后6行中声明的最后6个变量。

EDIT *参考： unset array_push

*此外，您在assoc数组中的第一个数据被索引为“用户”，但在assoc数组中的第二个数据未被索引，因此被索引为0。

$dataSet = [
            'users' => 
            [
                'id' => 1,
                'name' => "Alex",
                'username' => 'alex',
            ],
            [
                'id' => 2,
                'name' => "Alex",
                'username' => 'alex'
            ],
            [
                'id' => 2,
                'name' => "Peter Khot",
                'username' => 'peter',
            ]
        ];
$id = array_column($dataSet,'id');
$name = array_column($dataSet, 'name');
$username = array_column($dataSet, 'username');
$occur_id = array_count_values($id);
$occur_name = array_count_values($name);
$occur_username = array_count_values($username);
$most_occur_id  = array_search(max($occur_id),$occur_id);
$most_occur_name  = array_search(max($occur_name),$occur_name);
$most_occur_username  = array_search(max($occur_username),$occur_username);
$least_occur_id  = array_search(min($occur_id),$occur_id);
$least_occur_name  = array_search(min($occur_name),$occur_name);
$least_occur_username  = array_search(min($occur_username),$occur_username);

编辑* ：（如果出现多个最高的事件或所有相同的事件，只需在上面的代码下面添加下面的代码即可。）

$flag = true;
$most_occur_name_list = [];
$count = 0;
while($flag)
{
  $most_occur_name_ct =  max($occur_name);
  if($most_occur_name_ct == $count || $count == 0)
    {
      array_push($most_occur_name_list,array_search($most_occur_name_ct,$occur_name));
      unset($occur_name[array_search($most_occur_name_ct,$occur_name)]);
      $count = $most_occur_name_ct;
      if(count($occur_name) == 0)
      {
          $flag = false;
          break;
      }
    }
  else
    {
      $most_occur_name_ct = $count;
      $flag = false;
      break;
    }
}

//must reinitialize the array
$occur_name = array_count_values($name);
$flag = true;
$least_occur_name_list = [];
$count = 0;
while($flag)
{
  $least_occur_name_ct =  min($occur_name);
  if($least_occur_name_ct == $count || $count == 0)
    {
      array_push($least_occur_name_list,array_search($least_occur_name_ct,$occur_name));
      unset($occur_name[array_search($least_occur_name_ct,$occur_name)]);
      $count = $least_occur_name_ct;
      if(count($occur_name) == 0)
      {
          $flag = false;
          break;
      }
    }
  else
    {
      $least_occur_name_ct = $count;
      $flag = false;
      break;
    }
}
if($most_occur_name_ct == $least_occur_name_ct)
{
    $most_occur_name_list = [];
    $least_occur_name_list = [];
}
echo "<pre>";
print_r($most_occur_name_list);

Answer 2

如果您想获取多维数组中仅1个元素的最小和最大出现次数的列表，则此代码可能提供了一种较短的方法-代码中的注释...

$dataSet = [
    'users' =>
    [
        'id' => 1,
        'name' => "Alex",
        'username' => 'alex',
    ],
    [
        'id' => 2,
        'name' => "Alex",
        'username' => 'alex'
    ],
    [
        'id' => 2,
        'name' => "Peter Khot",
        'username' => 'peter',
    ],
    [
        'id' => 2,
        'name' => "Peter Khot",
        'username' => 'peter',
    ],
    [
        'id' => 2,
        'name' => "Paul Khot",
        'username' => 'Paul',
    ]
];

// Create an array which has the username column, but retaining the keys from
// the original array
$set = array_combine(array_keys($dataSet), 
        array_column($dataSet, "username" ));
// Summarise the values
$count = array_count_values($set);

// Get a list of the keys which match the max and min values
$minRecords = array_keys($count,min($count));
$maxRecords = array_keys($count,max($count));
// Fetch the details for the maximum value (first one returned)
$maxElements = [];
foreach ( $maxRecords as $max ) {
    $maxElements[] = $dataSet[array_search($max, $set )];
}

// Same for min values
$minElements = [];
foreach ( $minRecords as $min ) {
    $minElements[] = $dataSet[array_search($min, $set )];
}

print_r($maxElements);
print_r($minElements);

使用我添加的测试数据，您将获得输出...

Array
(
    [0] => Array
        (
            [id] => 1
            [name] => Alex
            [username] => alex
        )

    [1] => Array
        (
            [id] => 2
            [name] => Peter Khot
            [username] => peter
        )

)
Array
(
    [0] => Array
        (
            [id] => 2
            [name] => Paul Khot
            [username] => Paul
        )

)

php从多维数组获取最多和最少出现的值

2 个答案: