非法字符串偏移＆＃39;键＆＃39;

Question

我有这段代码：

// 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＆＃34; o＆＃34;屏幕上会显示3条警告：

警告：非法字符串偏移＆＃39;键＆＃39;在第41行的E：\ xampp \ htdocs \ riot \ index.php

我还尝试使用isset()验证条目，但似乎无法正常工作。

在这里检索$ championMastery：

$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，因为API返回一维数组，而foreach ($jsonChampion as $champion)是foreach ($jsonChampion as $champion) { if (isset($jsonChampion['key'])) { $championKey = $jsonChampion['key']; } } 中的字符串值。以下可以修复：

$jsonChampion

顺便说一句， $championKey是一维数组，因此您可以在不编写foreach循环的情况下检索if(is_array($jsonChampion) && isset($jsonChampion['key'])){ $championKey = $jsonChampion['key']; } ，如下所示：

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