Php JSON按第二级的键排序

嗨，有没有办法在解析之前对JSON进行排序？我想按过期时间分类。这是我的JSON

{
   "State of Origin 2014":{
      "1471137":{
         "EventID":1471137,
         "ParentEventID":1471074,
         "MainEvent":"State Of Origin Series 2014",
         "OutcomeDateTime":"2014-06-18 20:10:00.0000000",
         "Competition":"State of Origin 2014",
         "Competitors":{
            "ActiveCompetitors":3,
            "Competitors":[
               {
                  "Team":"New South Wales (2 - 1)",
                  "Win":"2.15"                 
               },
               {
                  "Team":"New South Wales (3 - 0)",
                  "Win":"3.05"                
               },
               {
                  "Team":"Queensland (2 - 1)",
                  "Win":"3.30"
               }
            ],
            "TotalCompetitors":3,
            "HasWinOdds":true
         },
         "EventStatus":"Open",
         "IsSuspended":false,
         "AllowBets":true
      },
      "1471074":{
         "EventID":1471074,
         "ParentEventID":0,
         "MainEvent":"State Of Origin Series 2014",  
         "OutcomeDateTime":"2014-07-09 20:10:00.0000000",
         "Competition":"State of Origin 2014",
         "Competitors":{
            "ActiveCompetitors":2,
            "Competitors":[
               {
                  "Team":"New South Wales",
                  "Win":"1.33"             
               },
               {
                  "Team":"Queensland",
                  "Win":"3.30"
               }
            ],
            "TotalCompetitors":2,
            "HasWinOdds":true
         },
         "EventStatus":"Open",
         "IsSuspended":false,
         "AllowBets":true
      }
   },
   "State of Origin 2014 Game 2":{
      "3608662":{
         "EventID":3608662,
         "ParentEventID":3269132,
         "MainEvent":"New South Wales v Queensland",
         "Competitors":{
            "ActiveCompetitors":39,
            "Competitors":[
               {
                  "TeamName":"New South Wales 6-10",
                  "Win":"4.70"              
               },
               {
                  "TeamName":"Queensland 91+",
                  "Win":"201.00"                
               }
            ],
            "TotalCompetitors":39,
            "HasWinOdds":true
         },
         "EventStatus":"Open",
         "IsSuspended":false,
         "AllowBets":true
      }

   }
}

这是我的密码

foreach ($json_a as $root_element => $childnode) {
  echo("{<br />");
    foreach( $childnode as $cKey => $subChild) {

      if($subChild['ParentEventID']=='0')
      {

       echo("Australian Rules : [");
         echo("<br />");
         echo("{<br />");
        echo "MainEvent: ".$subChild['MainEvent'];
        echo "<br />OutcomeDateTime: ".$subChild['OutcomeDateTime'];
         echo "<br />Competitors:[ <br />{";

        if (is_array($subChild['Competitors']['Competitors']) and count ($subChild['Competitors']['Competitors'])  == 2 ) {
            foreach($subChild['Competitors']['Competitors'] as $compKey => $compVal) {
            // Since your array contains Team and TeamName , I use array_key_exists to check whick key to use
             $teamName = array_key_exists('Team',$compVal) ? $compVal['Team'] :  $compVal['Name'];
             $win      = $compVal['Win'];
              echo "<br />Team: ".$teamName;
              echo "<br />Win: ".$win;
               echo "<br /> } , {";
         }
        }
}
    }

foreach（$json\u作为$root\u元素=>$childnode）{
回声（“{
”）；
foreach（$childnode作为$cKey=>$subChild）{
如果（$subChild['ParentEventID']=='0'）
{
echo（“澳大利亚规则：[”）；
回声（
）；
回声（“{
”）；
echo“MainEvent:.$subChild['MainEvent']；
echo“
OutcomeDateTime:“.$subChild['OutcomeDateTime'”；
回声“
竞争对手：[
{”；
如果（是数组（$subChild['Competitors']['Competitors']）和计数（$subChild['Competitors']['Competitors']）==2）{
foreach（$compKey=>$compVal的子孩子['Competitors']['Competitors']{
//由于您的数组包含Team和TeamName，所以我使用array\u key\u exists来检查要使用的whick key
$teamName=array_key_存在（'Team'，$compVal）？$compVal['Team']：$compVal['Name']；
$win=$compVal['win']；
echo“
团队：.$teamName；
回声“
赢：.$Win；
回声“
，{”；
}
}
}
}

---

我想按OutcomeDateTime对数据进行排序，但最新数据应该是Time。现在+10分钟。我的排序元素在第二级。有没有办法按OutcomeDateTime排序并获得前三名的结果？

ehhh…为什么要尝试使用json而不是使用内置php函数，如

json\u encode（）

？我使用json_encode读取json和$json_a=json_decode（$json.true）我想按outcomedate排序并获得前三个dataWell这是输出，我想将其作为json响应发送，而这一部分很好，我想按outcomedatetime排序数据，最新的outcomedatetime应该大于datatime。现在+10分钟，或者简单地按outcomedatetime排序json？？但即使在排序之后，我仍然不知道明白为什么要自己构建Json。当

$teamName

为“”时会发生什么？