PHP 遍历顺序键值答案

【问题标题】：PHP iterate through sequental key valuesPHP 遍历顺序键值
【发布时间】：2018-02-28 01:38:47
【问题描述】：

我正在从一个 JSON API 中获取 Pokemon 数据，它显示任何 Pokemon 的值。这里的目的是获取数据，显示可以在哪些游戏中找到口袋妖怪，以及在游戏中的哪些区域找到它们。

这是通过其encounters 键值访问的。我对通过以下方式访问特别感兴趣：

['location_area']['name'] 和 ['version']['name']

作为一个很好的 URL 示例：https://pokeapi.co/api/v2/pokemon/183/encounters

问题是，遇到数组索引值是一个 URL，我通过我自己的 Curl json 函数访问它，它工作正常，但只会给我数组数字索引值。

public function getPokemonLocation($searchTerm)
{

    /*
    Get the Pokemon via search term name
     */

    $url = $this->baseUrl.$searchTerm;
    $pokemonLocation = $this->getUrl($url);

    /* 
        $pokemonLocationUrl is the encounters subset i the array URL 
    */

    $pokemonLocationUrl =  $pokemonLocation['location_area_encounters'];
    $pokemonLocationEncounters = $this->getUrl('https://pokeapi.co/' . $pokemonLocationUrl);

    echo "<pre>";
    print_r($pokemonLocationEncounters);
    echo "</pre>";


     /* 
        Now grab the data needed from the name of location and what game regions they are from 
     */

    $pokemonAreaEncounterArea = array();
    $pokemonAreaEncounterGame = array();

      foreach($pokemonLocationEncounters as $key => $encounter)
      {
         $pokemonAreaEncounterArea[] = $encounter['location_area']['name'];
          $pokemonAreaEncounterGame[] = $encounter['version_details'][0]['version']['name'];
      }
        $pokemonLocationAndRegion = array_combine($pokemonAreaEncounterGame,$pokemonAreaEncounterArea);

        // print_r($pokemonLocationAndRegion);

        return  $pokemonLocationAndRegion;
 }

问题是，遇到数组索引值是一个 URL，我通过我自己的 Curl json 函数访问它，它工作正常，但只会给我数组数字索引值。

我可以轻松获取数据，如上图。但是，我们希望完全访问所有数组索引，而不仅仅是一个或少数数据。很想通过多个 foreach 来做到这一点，但宁愿干净地实现它。

编辑：这是上面 Poke APi 链接的第二个示例，如果您收到 504 服务器错误 - https://jsoneditoronline.org/?id=73911ec678c850f9b1ff131ac7ee738c

【问题讨论】：

pokeapi.co 给出 504 错误。你能提供一个json数据的样本吗？
@Cemal，当然我想这个链接应该足够了，jsoneditoronline.org/?id=73911ec678c850f9b1ff131ac7ee738c
这个$this->getUrl($url);返回（json_decoded）数组还是json？
与您目前得到的结果相比，您的预期结果是什么？
@Cemal - 是的，它通过 json_decode() 返回一个 json 数组

标签： php arrays oop

【解决方案1】：

根据您返回基于索引的数组的 json，您的代码应该是这样工作的。

public function getPokemonLocation($searchTerm) {

    /*
    Get the Pokemon via search term name
     */

    $url = $this->baseUrl . $searchTerm;
    $pokemonLocation = $this->getUrl($url);

    /*
        $pokemonLocationUrl is the encounters subset i the array URL
    */

    $pokemonLocationUrl = $pokemonLocation['location_area_encounters'];
    $pokemonLocationEncounters = $this->getUrl('https://pokeapi.co/' . $pokemonLocationUrl);

    echo "<pre>";
    print_r($pokemonLocationEncounters);
    echo "</pre>";

    $pokemonAreaEncounterArea = array();
    $pokemonAreaEncounterGame = array();

    /*
       Now grab the data needed from the name of location and what game regions they are from
    */

    for($i=0,$size=count($pokemonLocation);$i<$size;$i++) {
        $pokemonAreaEncounterArea[] = $pokemonLocation[$i]['location_area']['name'];
        $pokemonAreaEncounterGame[] = $pokemonLocation[$i]['version_details'][0]['version']['name'];
    }

    $pokemonLocationAndRegion = array_combine($pokemonAreaEncounterGame, $pokemonAreaEncounterArea);

    // print_r($pokemonLocationAndRegion);

    return $pokemonLocationAndRegion;
}

为了更清楚

    for($i=0,$size=count($pokemonLocation);$i<$size;$i++) {
        $pokemonAreaEncounterArea[] = $pokemonLocation[$i]['location_area']['name'];
        $pokemonAreaEncounterGame[] = $pokemonLocation[$i]['version_details'][0]['version']['name'];
    }

这将允许您遍历结果数组中的所有元素，并将它们放在$pokemonAreaEncounterArea 和$pokemonAreaEncounterGame 各自数组中的相同索引上

【讨论】：

【解决方案2】：

您可以像这样在迭代时组合目标数据：

$array=json_decode($json,true);
foreach($array as $item){
    $result[$item['version_details'][0]['version']['name']]=$item['location_area']['name'];
}
var_export($result);

输出：

array (
  'diamond' => 'great-marsh-area-6',
  'platinum' => 'sinnoh-route-215-area',
  'heartgold' => 'mt-mortar-1f',
  'ruby' => 'hoenn-route-120-area',
  'emerald' => 'hoenn-safari-zone-expansion-south',
  'leafgreen' => 'four-island-area',
  'black-2' => 'route-22-area',
  'x' => 'kalos-route-3-area',
)

【讨论】：