如何遍历JSON属性不知道，如果是数组或不是？ [英] how to iterate over JSON property not knowing if it's array or not?

问题描述

我有这个问题，其中一个API响应我DEPARTURESEGMENT有时只包含一个对象，有时包含对象的数组。根据这种情况下它，我似乎需要在我的foreach循环不同的逻辑。

I have this problem where an API responds to me with DEPARTURESEGMENT sometimes containing only one object, and sometimes containing an array of objects. Depending on which case it is, I seem to need different logics in my foreach-loop.

响应答：

{
  "getdeparturesresult":{
     "departuresegment":[{
        "departure":{
           "location":{
              "@id":"7461018",
              "@x":"12.523958",
              "@y":"57.938402",
              "name":"Noltorps centrum"
           },
           "datetime":"2014-12-04 23:05"
        },
        "direction":"Alingsås station",
        "segmentid":{
           "mot":{
              "@displaytype":"B",
              "@type":"BLT",
              "#text":"Buss"
           },
           "carrier":{
              "name":"Västtrafik",
              "url":"http://www.vasttrafik.se/",
              "id":"279",
              "number":"1"
           }
        }
     },
     {
        "departure":{
           "location":{
              "@id":"7461018",
              "@x":"12.523958",
              "@y":"57.938402",
              "name":"Noltorps centrum"
           },
           "datetime":"2014-12-04 23:05"
        },
        "direction":"Alingsås station",
        "segmentid":{
           "mot":{
              "@displaytype":"B",
              "@type":"BLT",
              "#text":"Buss"
           },
           "carrier":{
              "name":"Västtrafik",
              "url":"http://www.vasttrafik.se/",
              "id":"279",
              "number":"1"
           }
        }
     }
     ]
  }
}

工程与这个循环：

Works with this loop:

foreach ($apiData->getdeparturesresult->departuresegment as $m) {

虽然这种反应乙：

While this response B:

{
  "getdeparturesresult":{
     "departuresegment":{
        "departure":{
           "location":{
              "@id":"7461018",
              "@x":"12.523958",
              "@y":"57.938402",
              "name":"Noltorps centrum"
           },
           "datetime":"2014-12-04 23:05"
        },
        "direction":"Alingsås station",
        "segmentid":{
           "mot":{
              "@displaytype":"B",
              "@type":"BLT",
              "#text":"Buss"
           },
           "carrier":{
              "name":"Västtrafik",
              "url":"http://www.vasttrafik.se/",
              "id":"279",
              "number":"1"
           }
        }
     }
  }
}

需要这样一个循环（否则它抛出一个错误）：

needs a loop like this (otherwise it throws an error):

foreach ($apiData->getdeparturesresult as $m) {

有没有写环路故障安全的DEPARTURESEGMENT是对象数组或只是一个对象（括号[]是的JSON权结构的唯一区别？），或者我必须以某种方式试验和方式最先看到的DEPARTURESEGMENT是否根据结果是数组，并派遣到两个不同的循环？

Is there a way to write the loop failsafe for whether DEPARTURESEGMENT is an array of objects or just one object (the brackets [] is the only difference to the structure of the json right?) or do I have to somehow test and see first whether DEPARTURESEGMENT is an array or not, and dispatch to two different loops depending on the outcome?

推荐答案

您有几个方法可以帮助你：

You have a few methods that can help you:

• is_array


• is_object


• 的instanceof如果您收到 //特定对象


• 的GetType


• json_de code 的第二个参数，其中如果设置为true，试图去code中的JSON作为数组

• is_array
• is_object
• instanceof // if you receive specific object
• gettype
• json_decode second parameter, which if is set to true, tries to decode the json as an array

在你的情况，你很可能会通过执行以下罚款：

In you situation, you would probably be fine by doing the following:

if (is_object($entry)) {
    handleObject($entry);
} elseif (is_array($entry) && count($entry)) {
    foreach ($entry as $e) {
        handleObject($e);
    }
}

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