php解析json数组

function urltest(){
$url='http://121.43.153.80:8983/solr/collection1/select?q=+searchkey%3a%E4%BC%9A%E8%AE%A1&fq=cityid:73&start=0&rows=3&wt=json&indent=true&group=true&group.field=courseid';
// 1. 初始化
$ch = curl_init();
// 2. 设置选项，包括URL
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);
// 3. 执行并获取HTML文档内容
$output = curl_exec($ch);
// 4. 释放curl句柄
curl_close($ch);

$result= json_decode($output);
$jarray=$result->grouped->courseid->groups;
dump($jarray[0]);
}