關於擷取api返回json的處理

以下是api擷取的資料，怎麼擷取到第一組資料呢？只要一組
也就是 "20151224084":{"number":"9,7,6,8,0","dateline":"2015-12-24 20:02:55"}這個。

{"20151224084":{"number":"9,7,6,8,0","dateline":"2015-12-24 20:02:55"},"20151224083":{"number":"4,2,7,5,1","dateline":"2015-12-24 19:52:55"},"20151224082":{"number":"6,5,5,5,7","dateline":"2015-12-24 19:43:36"},"20151224081":{"number":"3,8,6,0,8","dateline":"2015-12-24 19:33:01"},"20151224080":{"number":"5,1,6,7,9","dateline":"2015-12-24 19:23:01"},"20151224079":{"number":"3,8,0,3,5","dateline":"2015-12-24 19:13:05"},"20151224078":{"number":"1,2,2,8,4","dateline":"2015-12-24 19:02:57"},"20151224077":{"number":"1,4,9,1,1","dateline":"2015-12-24 18:52:58"},"20151224076":{"number":"3,2,4,0,3","dateline":"2015-12-24 18:43:25"},"20151224075":{"number":"0,3,2,9,7","dateline":"2015-12-24 18:32:59"}}

回複內容：

以下是api擷取的資料，怎麼擷取到第一組資料呢？只要一組
也就是"20151224084":{"number":"9,7,6,8,0","dateline":"2015-12-24 20:02:55"}這個。

{"20151224084":{"number":"9,7,6,8,0","dateline":"2015-12-24 20:02:55"},"20151224083":{"number":"4,2,7,5,1","dateline":"2015-12-24 19:52:55"},"20151224082":{"number":"6,5,5,5,7","dateline":"2015-12-24 19:43:36"},"20151224081":{"number":"3,8,6,0,8","dateline":"2015-12-24 19:33:01"},"20151224080":{"number":"5,1,6,7,9","dateline":"2015-12-24 19:23:01"},"20151224079":{"number":"3,8,0,3,5","dateline":"2015-12-24 19:13:05"},"20151224078":{"number":"1,2,2,8,4","dateline":"2015-12-24 19:02:57"},"20151224077":{"number":"1,4,9,1,1","dateline":"2015-12-24 18:52:58"},"20151224076":{"number":"3,2,4,0,3","dateline":"2015-12-24 18:43:25"},"20151224075":{"number":"0,3,2,9,7","dateline":"2015-12-24 18:32:59"}}

array_shift();

$json = '{"20151224084":{"number":"9,7,6,8,0","dateline":"2015-12-24 20:02:55"},"20151224083":{"number":"4,2,7,5,1","dateline":"2015-12-24 19:52:55"},"20151224082":{"number":"6,5,5,5,7","dateline":"2015-12-24 19:43:36"},"20151224081":{"number":"3,8,6,0,8","dateline":"2015-12-24 19:33:01"},"20151224080":{"number":"5,1,6,7,9","dateline":"2015-12-24 19:23:01"},"20151224079":{"number":"3,8,0,3,5","dateline":"2015-12-24 19:13:05"},"20151224078":{"number":"1,2,2,8,4","dateline":"2015-12-24 19:02:57"},"20151224077":{"number":"1,4,9,1,1","dateline":"2015-12-24 18:52:58"},"20151224076":{"number":"3,2,4,0,3","dateline":"2015-12-24 18:43:25"},"20151224075":{"number":"0,3,2,9,7","dateline":"2015-12-24 18:32:59"}}';$data = json_decode($json,true);// 方法1$want = $data['20151224084']; // 方法2$want = array_pop(array_reverse($data,true));// 最笨的辦法$want = [];foreach($data as $key=>$value){  $want = [$key=>$value];  break;}

說明一下：第二種方式有個坑，就是當數組的長度特別長時，比如1000、10000，數組的翻轉是一件很消耗效能的操作，所以，根據你的實際情況借鑒性的使用，第三種方式雖然笨，但是效能不錯。
經友情提醒，剛才忘記了array_shift

json_decode($string, true)
轉為數組後你肯定會了。

