Php 多维数组的排序与过滤

我需要用这个多维数组捕捉每个国家的老年人

$arrayPersonas = array(
    array('id'=> "0AB239", 'country' => 1, 'firstname' => "Ernest"  , 'surname' => "Austin", 'age' => 30),
    array('id'=> "12A179", 'country' => 0, 'firstname' => "Frances", 'surname' => "Poole", 'age' => 23),
    array('id'=> "1A90B9", 'country' => 1, 'firstname' => "Jacob", 'surname' => "Matthews", 'age' => 30),
    array('id'=> "227FF9", 'country' => 2, 'firstname' => "Mina", 'surname' => "Day", 'age' => 30),
    array('id'=> "2A6F39", 'country' => 3, 'firstname' => "Earl", 'surname' => "Mills", 'age' => 20),
    array('id'=> "325E79", 'country' => 4, 'firstname' => "Dennis", 'surname' => "Ray", 'age' => 33),
    array('id'=> "32E478", 'country' => 4, 'firstname' => "Alex", 'surname' => "Fery", 'age' => 33),
    array('id'=> "3A4DB9", 'country' => 5, 'firstname' => "Rhoda", 'surname' => "Conner", 'age' => 35));

我还必须显示该数组的所有内容，因为我必须显示ID、Country、Firstname等

我试着按国家分类，然后选择年龄最大的人，但失败了

function filtrar_por($data){
array_filter($data, function( $var ){
  for($i=0; $i <= 5; $i++){
    switch ($i) {
      case 0:
        $country0 = $var['country'] == $i;
        $country0 = ordenar_por($country0);
        echo $country0;
        break;
      case 1:
        $country1 = $var['country'] == $i;
        break;
      case 2:
        $country2 = $var['country'] == $i;
        break;
      case 3:
        $country3 = $var['country'] == $i;
        break;
      case 4:
        $country4 = $var['country'] == $i;
        break;
      case 5:
        $country5 = $var['country'] == $i;
        break;
    }        
  }
});
}

  function ordenar_por($data){
    foreach ($data as $clave => $fila) {
      $orden1[$clave] = $fila['age'];
    }
    array_multisort($orden1, SORT_DESC, $data);
    return $data;
  }

函数过滤器（数据）{
数组过滤器（$data，function（$var）{
对于（$i=0；$i$fila）{
$orden1[$clave]=$fila['age']；
}
数组_multisort（$orden1，SORT_DESC，$data）；
返回$data；
}

---

我尝试使用此命令查看是否有效，但没有任何效果。

使用usort，如下所示：

<?php

$arrayPersonas = array(
    array('id'=> "0AB239", 'country' => 1, 'firstname' => "Ernest"  , 'surname' => "Austin", 'age' => 30),
    array('id'=> "12A179", 'country' => 0, 'firstname' => "Frances", 'surname' => "Poole", 'age' => 23),
    array('id'=> "1A90B9", 'country' => 1, 'firstname' => "Jacob", 'surname' => "Matthews", 'age' => 30),
    array('id'=> "227FF9", 'country' => 2, 'firstname' => "Mina", 'surname' => "Day", 'age' => 30),
    array('id'=> "2A6F39", 'country' => 3, 'firstname' => "Earl", 'surname' => "Mills", 'age' => 40),
    array('id'=> "325E79", 'country' => 4, 'firstname' => "Dennis", 'surname' => "Ray", 'age' => 33),
    array('id'=> "32E478", 'country' => 4, 'firstname' => "Alex", 'surname' => "Fery", 'age' => 50),
    array('id'=> "3A4DB9", 'country' => 5, 'firstname' => "Rhoda", 'surname' => "Conner", 'age' => 35));
    
$final_data = array();
function sortByOrder($a, $b) {
    return $a['age'] + $b['age'];
}

foreach( $arrayPersonas as $person){
    if(!empty($final_data[$person['country']])){
        foreach( $final_data[$person['country']] as $key => $value ){
            if( $final_data[$person['country']][$key]['age'] < $person['age'] ){
                unset($final_data[$person['country']][$key]);
                $final_data[$person['country']][] = $person;
            }else if( $final_data[$person['country']][$key]['age'] == $person['age'] ){
                $final_data[$person['country']][] = $person;
            }
        }
    }else{
        $final_data[$person['country']][] = $person;
        usort($final_data[$person['country']], 'sortByOrder');
    }
}
print_r($final_data);

---

我有另一种方法来找到你想要的结果。它可能比Burhan anwser效率稍低，但我认为它更具可读性

<?php

$persons = array(
    array('id'=> "0AB239", 'country' => 1, 'firstname' => "Ernest"  , 'surname' => "Austin", 'age' => 30),
    array('id'=> "12A179", 'country' => 0, 'firstname' => "Frances", 'surname' => "Poole", 'age' => 23),
    array('id'=> "1A90B9", 'country' => 1, 'firstname' => "Jacob", 'surname' => "Matthews", 'age' => 30),
    array('id'=> "227FF9", 'country' => 2, 'firstname' => "Mina", 'surname' => "Day", 'age' => 30),
    array('id'=> "2A6F39", 'country' => 3, 'firstname' => "Earl", 'surname' => "Mills", 'age' => 20),
    array('id'=> "325E79", 'country' => 4, 'firstname' => "Dennis", 'surname' => "Ray", 'age' => 33),
    array('id'=> "32E478", 'country' => 4, 'firstname' => "Alex", 'surname' => "Fery", 'age' => 50),
    array('id'=> "3A4DB9", 'country' => 5, 'firstname' => "Rhoda", 'surname' => "Conner", 'age' => 35)
);
    
    // Get the different countries you can have
    $differentCountries = array_unique(array_column($persons, "country"));
    
    $result = [];
    
    
    // Loop over the different contries
    foreach ($differentCountries as $countryId) {
        
        // Get the all values for this specific country
        $valuesForThisCountry = array_filter($persons, function ($person) use ($countryId) {
            return $person["country"] == $countryId;
        });
        
        // Get an associative array with "id" as key and "age" as value
        $formattedArray = array_column($valuesForThisCountry, "age", "id");

        // Get the older ones
        $olders = array_keys($formattedArray, max($formattedArray));
        
        // Get the initial values of persons you found
        $personsById = array_filter($persons, function ($person) use ($olders) {
            // Check if the "id" is in the $olders
            return in_array($person["id"], $olders);
        });
        
        // Finally, put the result in the $result array
        $result = array_merge($result, $personsById);
        
    }
    
    
    print_r($result);

你能告诉我们你尝试了什么吗？你需要的结果到底是什么？你只需要知道谁的年龄大？或者把数组从大到小排序？函数ordenar_por（$data）{foreach（$clave=>$fila）{$orden1[$clave]=$fila['age']；}array\u multisort（$orden1，sort\u DESC，$data）；返回$data；}@Burnakashour我只需要向老年人展示所有信息和订单ID@CornelRaiu在主要帖子上编辑谢谢，但我需要显示每个帖子中的每个年长者country@Zano你说的
我只需要按ID显示年长者的所有信息和订单
对不起，我弄错了。在主要帖子上，我解释的第一行。@Zano更新请注意看！例如，国家1有两个人是同一年的人，你怎么能同时显示这两个人？但这并不能回答他提出的全部问题，他希望完整的数组被索引为国家数组，每个国家都是一个老年人数组，如果同一个国家有相同的年龄，那么你应该将他们添加到数组中。我更新了代码片段，我认为这一次是正确的；）