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问如何使用多维数组的三级值生成数组
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Stack Overflow用户

提问于 2017-05-19 05:48:03

回答 2查看 484关注 0票数 1

如下图所示，我有一个多维数组，在第三层中有一个关联数组，我试图基于gamesCount来操作它。我想要生成一个新的项目数组与最高的 gamesCount在每项运动。有没有一种有效的方法可以避免过度杀戮？

编辑:它可以是运动的n数，因此目标是为每项运动找到gameCounts的最大数目。

初始数组：

$array = [
    [
        ["sport" => "soccer", "gamesCount" => 5, "gamesId" => 1],
        ["sport" => "soccer", "gamesCount" => 3, "gamesId" => 2],
        ["sport" => "soccer", "gamesCount" => 10, "gamesId" => 3],
        ["sport" => "soccer", "gamesCount" => 10, "gamesId" => 4],
    ],
    [
        ["sport" => "basketball", "gamesCount" => 1, "gamesId" => 5],
        ["sport" => "basketball", "gamesCount" => 3, "gamesId" => 6],
        ["sport" => "basketball", "gamesCount" => 3, "gamesId" => 7],
        ["sport" => "basketball", "gamesCount" => 8, "gamesId" => 8],
    ]
];

预期结果：

array(3) {
      [0]=>
      array(3) {
        ["sport"]=>
        string(6) "soccer"
        ["gamesCount"]=>
        int(10)
        ["gamesId"]=>
        int(3)
      }
      [1]=>
      array(3) {
        ["sport"]=>
        string(6) "soccer"
        ["gamesCount"]=>
        int(10)
        ["gamesId"]=>
        int(4)
      }
      [2]=>
      array(3) {
        ["sport"]=>
        string(10) "basketball"
        ["gamesCount"]=>
        int(5)
        ["gamesId"]=>
        int(8)
      }
}

multidimensional-array

max

php

arrays

sorting

回答 2

Stack Overflow用户

回答已采纳

发布于 2017-05-19 05:57:38

试试这个，检查一下现场演示

$result = [];
foreach($array as $v)
{
$max = max(array_column($v, 'gamesCount'));
    $result = array_merge($result, array_filter($v, function($value)use($max){return $value['gamesCount'] == $max;}));
}
var_dump($result);

票数 1

Stack Overflow用户

发布于 2017-05-19 06:24:22

输入：

$array=[
    [
        ["sport"=>"soccer","gamesCount"=>5,"gamesId"=>1],
        ["sport"=>"soccer","gamesCount"=>3,"gamesId"=>2],
        ["sport"=>"soccer","gamesCount"=>10,"gamesId"=>3],
        ["sport"=>"soccer","gamesCount"=>10,"gamesId"=>4]
    ],
    [
        ["sport"=>"basketball","gamesCount"=>1,"gamesId"=>5],
        ["sport"=>"basketball","gamesCount"=>3,"gamesId"=>6],
        ["sport"=>"basketball","gamesCount"=>3,"gamesId"=>7],
        ["sport"=>"basketball","gamesCount"=>8,"gamesId"=>8]
    ]
];

方法1“具有两个循环的最容易阅读的版本”(演示)

foreach($array as $sport_array){
    $most_in_sport=max(array_column($sport_array,'gamesCount'));  // get highest gamesCount in sport's subarray      
    foreach($sport_array as $sport_row){
        if($sport_row['gamesCount']==$most_in_sport){  // only keep a sport's subarray (row) if its gamesCount is the highest in the sport
            $most_per_sport[]=$sport_row;
        }
    }
}
var_export($most_per_sport);

方法2：“淫秽曲折的单线”php最低版本: 5.6 (对于那些不害怕一条龙启示录的人来说--参考:第一条评论@ https://stackoverflow.com/a/43950486/2943403.) (演示)

var_export(array_merge(...array_map(function($sport_array){$most_in_sport=max(array_column($sport_array,'gamesCount')); return array_filter($sport_array,function($sport_row)use($most_in_sport){return $sport_row['gamesCount']==$most_in_sport;});},$array)));

输出：

array (
  0 => 
  array (
    'sport' => 'soccer',
    'gamesCount' => 10,
    'gamesId' => 3,
  ),
  1 => 
  array (
    'sport' => 'soccer',
    'gamesCount' => 10,
    'gamesId' => 4,
  ),
  2 => 
  array (
    'sport' => 'basketball',
    'gamesCount' => 8,
    'gamesId' => 8,
  ),
)

决定使用哪种方法取决于每个程序员。第一种方法将是最有效和最容易理解的。第二个变量将生成更少的全局变量，并且需要更少的代码行。如果你试图避免“过度杀戮”的方法#1是无法击败的。

票数 1

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/44062301

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