Php 如何从这个JSON数组中获取变量值？

因此，我有一个返回以下内容的URL：

[{"_id":{"champ2_id":63,"champ1_id":2,"role":"TOP"},"count":4,"champ1":{"thirtyToEnd":0,"goldEarned":10727.5,"zeroToTen":0,"minionsKilled":158,"winrate":0,"assists":6.25,"role":"TOP","deaths":6,"kills":4,"wins":0,"totalDamageDealtToChampions":17350.75,"twentyToThirty":0,"tenToTwenty":0,"neutralMinionsKilledTeamJungle":1.75,"killingSprees":0.75,"weighedScore":27214.5375},"champ2":{"twentyToThirty":0,"wins":4,"winrate":1,"kills":5.75,"neutralMinionsKilledTeamJungle":5,"totalDamageDealtToChampions":21881.25,"role":"TOP","assists":7,"tenToTwenty":0,"thirtyToEnd":0,"zeroToTen":0,"goldEarned":12371.75,"killingSprees":1.25,"minionsKilled":140.5,"deaths":4.25,"weighedScore":33166.587499999994}]

我已经学习了如何在URL返回更简单的内容时获取数组中键的值。例如，如果URL返回：

{"id":34743514,"accountId":49161997,"name":"League of Fiddle","profileIconId":786,"revisionDate":1514093712000,"summonerLevel":52}

我可以用以下代码回显id：

$json = file_get_contents(URL);
$data = json_decode($json, true);
echo $data['id'];

那很容易。但是当我尝试对更复杂的东西使用相同的代码时，比如说我想得到_idchamp2_id的值，我尝试了：

$json = file_get_contents(URL);
$data = json_decode($json, true);
echo $data['_id']['champ2_id'];

但这表明_id是一个未定义的索引。我做错了什么？

应该是

$data[0]['_id']['champ2_id'];

---

它是一个数组中的数组。或者是一个多维数组。试试

$data[0][''u id']['champ2\u id']

谢谢！当它允许我的时候，我会选择这个作为最佳答案