PHP对象属性/值错误处理

Question

{
   "AFL Round 16":{
      "4166082":{
         "EventID":4166082,
         "ParentEventID":3744759,
         "MainEvent":"North Melbourne v Hawthorn",   
         "OutcomeDateTime":"2014-07-06 02:00:00",    
         "Competitors":{
            "Competitors":[
               {
                  "Team":"Hawthorn To Win 40+",
                  "Win":"3.00"

               }
            ],
            "ActiveCompetitors":1,
            "TotalCompetitors":1,
            "HasWinOdds":true
         },
         "EventStatus":"Open"
      },
      "4167064":{
         "EventID":4167064,
         "ParentEventID":3744759,
         "MainEvent":"North Melbourne v Hawthorn", 
         "OutcomeDateTime":"2014-07-06 02:00:00",  
         "Competitors":{
            "Competitors":[
               {
                  "Team":"Hawthorn (-5.5)",
                  "Win":"1.86"

               },
               {
                  "Team":"North Melbourne (+5.5)",
                  "Win":"1.86"

               }
            ],
            "ActiveCompetitors":2,
            "TotalCompetitors":2,
            "HasWinOdds":true
         },
         "EventStatus":"Open"
      }

  }
}

我正在使用PHP解析json对象，下面是我的json示例。一切都很好。我只想检查对象属性/值是否存在，如果是，那么抛出错误--例如，我想检查EventID、ParentEventID、OutcomeDateTime、Team (在竞争对手数组中)是有效的属性名，它们不是null。

这是我的代码的几行。

$SortedByDate = array();//Sorted By Date Array i.e key=EventID and value=OutcomeDateTime


//Accessing Root Element0
foreach ($json_a as $root_element => $childnode) {
    //Accessing child elements
    foreach( $childnode as $cKey => $subChild) {
        $OutcomeDateTime_UTC=gmdate('Y-m-d H:i:s', strtotime($subChild['OutcomeDateTime']));

        //checking ParentEventID=0 , Competitors array = 2 and OutcomeDateTime is greater than current time + 10 min
        if($subChild['ParentEventID']=='0' and is_array($subChild['Competitors']['Competitors']) and count ($subChild['Competitors']['Competitors'])  == 2 and $OutcomeDateTime_UTC>=$NewDateTime and !preg_match('/\(Live\)/',$subChild['MainEvent']) ) {
            //Inserting values into array
            $SortedByDate[$cKey] = $subChild['OutcomeDateTime'];;
        }
    }
}

我尝试添加if(isset($subChild['OutcomeDateTime']) || is_null($subChild['OutcomeDateTime']))来检查属性名是否为OutcomeDateTime，并且它不是null，并将json的值(OutcomeDateTime)更改为空，但我得到了一个"Invalid argument supplied for foreach()"错误

是否有更好的方法在解析之前检查属性/值？

Answer 1

试试这个，看看它是否符合你的意思。如果不是，我不明白。如果它解决了你的问题我会解释为什么..。

//Accessing Root Element0
foreach ($json_a as $root_element => &$childnode) {
    //Accessing child elements
    foreach( $childnode as $cKey => &$subChild) {
        $OutcomeDateTime_UTC=gmdate('Y-m-d H:i:s', strtotime($subChild['OutcomeDateTime']));

        //checking ParentEventID=0 , Competitors array = 2 and OutcomeDateTime is greater than current time + 10 min
        if($subChild['ParentEventID']=='0' && is_array($subChild['Competitors']['Competitors']) && count ($subChild['Competitors']['Competitors'])  == 2 && $OutcomeDateTime_UTC>=$NewDateTime && !preg_match('/\(Live\)/',$subChild['MainEvent']) ) {
            //Inserting values into array
            $SortedByDate[$cKey] = $subChild['OutcomeDateTime'];
        }
        if(isset($subChild['OutcomeDateTime']) && !is_null($subChild['OutcomeDateTime'])) {
            $subChild['OutcomeDateTime'] = null;
        }
    }
}

Answer 2

我只想检查对象属性/值是否存在，如果是，那么抛出错误

您的措辞没有意义，也有点奇怪，也许您是说要验证每个键(如果存在的话)，如果这些键的每个值都不是空的。

例如，我想检查EventID、ParentEventID、OutcomeDateTime、Team (在竞争对手数组中)是有效的属性名，它们不是null。

这是一把小提琴。尝试删除json字符串中的一些元素以检查：Fiddle

$json_a = '{ "AFL Round 16":{ "4166082":{ "EventID":4166082, "ParentEventID":3744759, "MainEvent":"North Melbourne v Hawthorn", "OutcomeDateTime":"2014-07-06 02:00:00", "Competitors":{ "Competitors":[ { "Team":"Hawthorn To Win 40+", "Win":"3.00" } ], "ActiveCompetitors":1, "TotalCompetitors":1, "HasWinOdds":true }, "EventStatus":"Open" }, "4167064":{ "EventID":4167064, "ParentEventID":3744759, "MainEvent":"North Melbourne v Hawthorn", "OutcomeDateTime":"2014-07-06 02:00:00", "Competitors":{ "Competitors":[ { "Team":"Hawthorn (-5.5)", "Win":"1.86" }, { "Team":"North Melbourne (+5.5)", "Win":"1.86" } ], "ActiveCompetitors":2, "TotalCompetitors":2, "HasWinOdds":true }, "EventStatus":"Open" } }}';
$json_a = json_decode($json_a, true);
$json_a = reset($json_a); // ignore these parts since you already know how to get them

$errors = array();
$valid_keys = array('EventID', 'ParentEventID', 'OutcomeDateTime', 'MainEvent', 'Competitors', 'EventStatus');
foreach($json_a as $event_id => $values) {
    // check for keys
    $keys = array_keys($values);
    foreach($valid_keys as $key) {
        if(!in_array($key, $keys)) {
            // check keys, not valid if it goes here
            $errors[] = "<b>$key</b> is missing on your data <br/>";
        } else {
            // valid keys, check values
            if(empty($values[$key])) {
                // empty values
                $errors[] = "<b>$key</b> has an empty value <br/>";
            }
        }
    }

    // next checking, competitors
    foreach($values['Competitors']['Competitors'] as $competitors) {
        if(empty($competitors)) {
            // if competitors is empty
            $errors[] = "<b>Competitors</b> has an empty value <br/>";
        }
    }
}

if(!empty($errors)) {
    // not a good error triggering device, just change this to something else
    trigger_error('<pre>'.implode($errors).'</pre>', E_USER_ERROR);
}