非法字符串偏移 'key'

Question

我有这个代码：

// Champion name and splash art
$endpointChampion = file_get_contents("https://global.api.riotgames.com/api/lol/static-data/BR/v1.2/champion/".$championMastery."?api_key=MYKEY");
$jsonChampion = json_decode($endpointChampion, true);

foreach ($jsonChampion as $champion) {  
    if (isset($jsonChampion['key'])) {
        $championKey = $champion['key'];
    }
}

但是这个 $championKey 变量返回“o”并且屏幕上会提示 3 个警告：

警告：E:\xampp\htdocs\riot\index.php 第 41 行中的非法字符串偏移 'key'

我还尝试使用isset() 验证条目，但似乎无法正常工作。

$championMastery 在此处检索：

$endpointMastery = file_get_contents("https://br.api.riotgames.com/championmastery/location/BR1/player/8083198/champions?api_key=MYKEY");
$jsonMastery = json_decode($endpointMastery, true);

foreach ($jsonMastery as $mastery) {
    $championMastery = $mastery['championId'];
    $masteryLevel = $mastery['championLevel'];
}

Answer 1

您收到错误是因为 API 返回一维数组，而 $champion 是 foreach ($jsonChampion as $champion) 中的字符串值。以下可以修复：

foreach ($jsonChampion as $champion) {
      if (isset($jsonChampion['key'])) {
          $championKey = $jsonChampion['key'];
      }
}

顺便说一句， $jsonChampion 是一维数组，因此您可以在不编写 foreach 循环的情况下检索 $championKey，如下所示：

if(is_array($jsonChampion) && isset($jsonChampion['key'])){
      $championKey = $jsonChampion['key'];
}