从 php 中的数据中检索唯一值或数组答案

【问题标题】：retrieve unique values or arrays from data in php从 php 中的数据中检索唯一值或数组
【发布时间】：2023-04-03 12:10:01
【问题描述】：

我正在构建一个过滤函数，它遍历提供的数据以根据声明的数组键生成选择字段选项。

当键值为字符串时，我可以让我的函数输出预期的唯一结果，但是当我将键设置为数组时，我只能得到前 1 个结果。

这是我的例子：

    /* ----------------------
    Dump the output
---------------------- */
function dump($data) {
  if(is_array($data)) { //If the given variable is an array, print using the print_r function.
    print "<pre>\n";
    print_r($data);
    print "</pre>";
  } elseif (is_object($data)) {
    print "<pre>\n";
    var_dump($data);
    print "</pre>";
  } else {
    print "=========&gt; ";
    var_dump($data);
    print " &lt;=========";
  }
}

$data = '{"filter":[{"department":null,"location":{"country":"United States","country_code":"US","region":"New York","region_code":"NY","city":"New York","zip_code":null,"telecommuting":false}},{"department":null,"location":{"country":"United Kingdom","country_code":"GB","region":"England","region_code":"England","city":"Leeds","zip_code":null,"telecommuting":false}},{"department":"Project Management","location":{"country":"United Kingdom","country_code":"GB","region":"England","region_code":"England","city":"Manchester","zip_code":null,"telecommuting":false}},{"department":"Project Management","location":{"country":"United Kingdom","country_code":"GB","region":"England","region_code":"England","city":"London","zip_code":null,"telecommuting":false}},{"department":"Customer Success","location":{"country":"United Kingdom","country_code":"GB","region":"England","region_code":"England","city":"London","zip_code":null,"telecommuting":false}},{"department":null,"location":{"country":"United Kingdom","country_code":"GB","region":"England","region_code":"England","city":"London","zip_code":null,"telecommuting":false}}]}';

$response = json_decode($data, true);

// get unique values in array
function getUniqueValues($array, $args) {

    $result = array();

    foreach($array as $value) {

      if(!empty($value[$args])) {

        if(is_array($value[$args])) {

          foreach ($value[$args] as $k => $v) {
            $result[$k] = $v;
          }

        } else {

          $result[] = $value[$args];

        }

      }

    }

    return array_unique($result);
}

dump(getUniqueValues($response['filter'], 'location'));

dump(getUniqueValues($response['filter'], 'department'));

任何匹配“部门”的键的输出，输出预期结果

Array 
(
    [0] => Project Management
    [2] => Customer Success
)

但是，当使用数组作为值引用键时，我没有得到预期的结果。

Array
(
    [country] => United Kingdom
    [country_code] => GB
    [region] => England
    [city] => London
    [zip_code] => 
)

我期待看到的是与此类似的东西。

Array
(
    [0] => (
        [country] => United Kingdom
        [country_code] => GB
        [region] => England
        [city] => London
        [zip_code] => 
    ),
    [1] => (
        [country] => United Kingdom
        [country_code] => GB
        [region] => England
        [city] => Manchester
        [zip_code] => 
    )
)

我想我似乎错过了一些东西，或者我误解了array_unique($myArray) 的工作原理。无论如何，我该如何解决这个问题以提供正确的输出？

任何帮助将不胜感激。

谢谢:)

【问题讨论】：

也许尝试递归？

标签： php multidimensional-array array-unique

【解决方案1】：

基于这个答案https://stackoverflow.com/a/2561283/1376820，我修改了循环以将每个数组值推入一个新数组$arrChild。

if(is_array($value[$args])) {

    array_push($arrChild, $value[$args] );

    $result = array_intersect_key($arrChild, array_unique(array_map('serialize', $arrChild)));

  }

此处为完整示例：https://eval.in/990453

【讨论】：