Question

先前感谢您提供建议。我有一个从REST服务检索的以下JSON。

    "events": [
        {
        "id": 408,
        "name": "My Test1",
        "modulename": "test",
        "instance": 0,
        "timestart": 1470370500,
        "timeduration": 864000,

        },
        {
        "id": 418,
        "name": "Quiz Open",
        "modulename": "quiz",
        "instance": 225,
        "timestart": 1473737880,
        "timeduration": 0,
        },
        {
        "id": 423,
        "name": "Quiz Close",
        "modulename": "quiz",
        "instance": 225,
        "timestart": 1476665040,
        "timeduration": 0,
        },
        {
        "id": 409,
        "name": "August event",
        "modulename": "event",
        "instance": 0,
        "timestart": 1467295200,
        "timeduration": 2474700,
        }
    ]

我需要以下面的JSON格式读取JSON和输出

"output": [   
    {
       "name": 
        "Start":
        "End":
    }

]

我的问题出现在名称为＆＃34; Quiz＆＃34;这是＆＃34; modulename＆＃34;在JSON输入中。测验将在日期（时间段）打开，模块名称为＆＃34;测验＆＃34;和＆＃34;实例＆＃34; - 225作为唯一标识符，以具有相同实例ID的不同日期（timestart）结束。 json在一个大数组中包含100个事件。我和＃34;结束＆＃34;在输出中，json对象是＆＃34; timestart＆＃34; +＆＃34; timeduration＆＃34;。

我的问题是，如果模块名称是＆＃34; quiz＆＃34;那么迭代的有效算法是什么？获取实例并遍历整个数组以查找实例的下一个出现并添加到输出json。有什么指针吗？

Answer 1

如果你的json是这样的话，首先要确保你的json格式正确： -

$str='{"events": [
    {
    "id": 408,
    "name": "My Test1",
    "modulename": "test",
    "instance": 0,
    "timestart": 1470370500,
    "timeduration": 864000
    },
    {
    "id": 418,
    "name": "Quiz Open",
    "modulename": "quiz",
    "instance": 225,
    "timestart": 1473737880,
    "timeduration": 0
    },
    {
    "id": 423,
    "name": "Quiz Close",
    "modulename": "quiz",
    "instance": 225,
    "timestart": 1476665040,
    "timeduration": 0
    },
    {
    "id": 409,
    "name": "August event",
    "modulename": "event",
    "instance": 0,
    "timestart": 1467295200,
    "timeduration": 2474700
    }
]}';

然后你可以这样做....`

$arr=json_decode($str,true);
$result=array();
$prevInstance=array();
foreach($arr['events'] as $key=>$val){
if($val['modulename']=='quiz' && array_key_exists($val['instance'],    $prevInstance)){
$k= $prevInstance[$val['instance']];
$result['output'][$k]['End']=$val['timestart']; 
}else{
$tmp['name']=$val['name'];
$tmp['Start']=$val['timestart'];
$tmp['End']=$val['timeduration'];
$result['output'][$val['id']]=$tmp;     
}
$prevInstance[$val['instance']]=$val['id'];;
}
$data=array();
foreach ($result['output'] as $ret){
$data['output'][]=$ret;
}
echo "<pre>";
echo json_encode($data);

Answer 2

$array = json_decode($event,true); // first decode your retrieved array 
$output = array();

foreach ($array as $key) { // then loop through it
if ($array[$key]['modulename'] == "quiz") { // only select if modulename is "quiz"
        $obj = array("name" => $array[$key]['name'], "Start" => $array[$key]['timestart'], "END" => ($array[$key]['timestart'] + $array[$key]['timeend']));
        array_push($output, $obj);
    } else {
        return;
    }
}

返回json_encode（$ output）; //最后用于JSON中的输出，对输出数组进行编码

//output: [{"name":"quiz","Start":123,"END":579},{"name":"quiz","Start":123,"END":579},{"name":"quiz","Start":123,"END":579}]

如何通过密钥从Json收集值

2 个答案: