用PHP JSON解码JSON解析URL

Question

我JSON数据：

{"took":3, 
"timed_out":false, 
"_shards":{ "total":5, 
      "successful":5, 
      "failed":0 
      }, 
"hits":{"total":105, 
     "max_score":1.0, 
     "hits":[ 
      {"_index":"csv", 
      "_type":"logs", 
      "_id":"AVeyr-BQodQ9UhW1sdW0", 
      "_score":1.0, 
      "_source":{"message":"james,wonder\r", 
         "@version":"1", 
         "@timestamp":"2016-10-11T07:40:52.332Z", 
         "path":"D:\\logstash-2.4.0\\bin\\Book1.csv", 
         "host":"CHNL-LT-544", 
         "fname":"fa1368a93aa39b2346329c1734be1f4b", 
         "lname":"wonder" 
         } 
      }, 
      {"_index":"csv", 
      "_type":"logs", 
      "_id":"AVeyr-BQodQ9UhW1sdW1", 
      "_score":1.0, 
      "_source":{"message":"muskaan, wonder\r", 
      "@version":"1", 
      "@timestamp":"2016-10-11T07:40:52.332Z", 
      "path":"D:\\logstash-2.4.0\\bin\\Book1.csv", 
      "host":"CHNL-LT-544", 
      "fname":"479085e94d305129527fa80978613e95", 
      "lname":"wonder"} 
      }, 
{"_index":"csv","_type":"logs","_id":"AVeyr-BQodQ9UhW1sdW3","_score":1.0,"_source":{"message":"altimetrik,india\r","@version":"1","@timestamp":"2016-10-11T07:40:52.333Z","path":"D:\\logstash-2.4.0\\bin\\Book1.csv","host":"CHNL-LT-544","fname":"8b3ecf275832c79b36d62d74f47257c9","lname":"india"}},{"_index":"csv","_type":"logs","_id":"AVeyr-BQodQ9UhW1sdW8","_score":1.0,"_source":{"message":"kool,indiae\r","@version":"1","@timestamp":"2016-10-11T07:40:52.335Z","path":"D:\\logstash-2.4.0\\bin\\Book1.csv","host":"CHNL-LT-544","fname":"d2edbdce885720c70f38f36748c37600","lname":"indiae"}},{"_index":"csv","_type":"logs","_id":"AVeyr-BQodQ9UhW1sdXA","_score":1.0,"_source":{"message":"ds,dssd\r","@version":"1","@timestamp":"2016-10-11T07:40:52.336Z","path":"D:\\logstash-2.4.0\\bin\\Book1.csv","host":"CHNL-LT-544","fname":"91594a75bc6bfb0ec800d4f454e1fe87","lname":"dssd"}},{"_index":"csv","_type":"logs","_id":"AVeytJ0iodQ9UhW1sdXf","_score":1.0,"_source":{"message":"kool,india\r","@version":"1","@timestamp":"2016-10-11T07:46:02.839Z","path":"D:\\logstash-2.4.0\\bin\\Book1.csv","host":"CHNL-LT-544","fname":"d2edbdce885720c70f38f36748c37600","lname":"india"}},{"_index":"csv","_type":"logs","_id":"AVeytJ0iodQ9UhW1sdXi","_score":1.0,"_source":{"message":"karnataka,india\r","@version":"1","@timestamp":"2016-10-11T07:46:02.840Z","path":"D:\\logstash-2.4.0\\bin\\Book1.csv","host":"CHNL-LT-544","fname":"2a0785caed6bfd2ffb6ad5a449f2bd0e","lname":"india"}},{"_index":"csv","_type":"logs","_id":"AVeytv9hodQ9UhW1sdXq","_score":1.0,"_source":{"message":"james,wonder\r","@version":"1","@timestamp":"2016-10-11T07:48:39.550Z","path":"D:\\logstash-2.4.0\\bin\\Book1.csv","host":"CHNL-LT-544","fname":"fa1368a93aa39b2346329c1734be1f4b","lname":"wonder"}},{"_index":"csv","_type":"logs","_id":"AVeytv9hodQ9UhW1sdX0","_score":1.0,"_source":{"message":"rajasthan,india\r","@version":"1","@timestamp":"2016-10-11T07:48:39.558Z","path":"D:\\logstash-2.4.0\\bin\\Book1.csv","host":"CHNL-LT-544","fname":"449b07d9038569b2d69243dadfae0371","lname":"india"}},{"_index":"csv","_type":"logs","_id":"AVeytv9hodQ9UhW1sdX5","_score":1.0,"_source":{"message":"najeeb,shariff\r","@version":"1","@timestamp":"2016-10-11T07:48:39.573Z","path":"D:\\logstash-2.4.0\\bin\\Book1.csv","host":"CHNL-LT-544","fname":"be7a5e98258338fa63086f44e8bd1850","lname":"shariff"}}]}} 

我想从这个JSON打印只有2场; fname和lname。请告诉我如何使用PHP来实现这一点。

$url = 'localhost:9200/csv/_search';; 
$content = file_get_contents($url); 
$json = json_decode($content, true); 
foreach($json['hits'] as $item) { 
    print $item['fname']; 
} 

但得到错误未定义指数fname

Answer 1

$url = 'localhost:9200/csv/_search';; 
$content = file_get_contents($url); 
$json = json_decode($content, true); 

foreach($json['hits']['hits'] as $item) { 
    echo "<p>{$item['_source']['fname']}</p>"; 
    echo "<p>{$item['_source']['lname']}</p>"; 
} 

阵列的路径和lname是这样[hits][hits][0][_source][fname]和[hits][hits][0][_source][lname]。应在循环中迭代[hits][hits]以访问每个_source元素。

由于RiggsFolly说，你需要做print_r($json)来看看数组是如何构造的，特别是当你遇到嵌套数组时。

希望它有帮助！