如何使用 PHP 将 JSON 数据迭代到循环中？

Question

I need to iterate some JSON formatted data into loop using PHP. My JSON data is below:

{  
   "question1":{  
      "ques":"questin1",
      "optional":[  
         {  
            "opt":"option1"
         },
         {  
            "opt":"option2"
         }
      ]
   },
   "question2":{  
      "ques":"questin2",
      "optional":[  
         {  
            "opt":"option1"
         },
         {  
            "opt":"option2"
         }
      ]
   }
}

I need to run the loop so that the result data will come in above format using PHP.

Answer 1

Convert the php object to json object using json_encode

// convert object => json
$json = json_encode($myObject);

This might helpful: https://stackoverflow.com/a/9858457/6285410

Answer 2

What you showed us is a Possible JSON Data. In this Format, we can do nothing with it in PHP except by decoding back into Native PHP Object. Once that is done, You can access all the Properties of the Object like you do with normal PHP Object like $objData->questin1 . Here's what is meant with the above statements:

    <?php

        $strJson = '{
           "question1":{
              "ques":"questin1",
              "optional":[
                 {
                    "opt":"option1"
                 },
                 {
                    "opt":"option2"
                 }
              ]
           },
           "question2":{
              "ques":"questin2",
              "optional":[
                 {
                    "opt":"option1"
                 },
                 {
                    "opt":"option2"
                 }
              ]
           }
        }';

        $objData    = json_decode($strJson);
        var_dump($objData);


        // NOW, TO GET AT EACH OF THE PROPERTIES OF THE OBJECT IS EASY...

        // ACCESS THE question1 OR question2
        $q1     = $objData->question1;
        $q2     = $objData->question2;

        // ACCESS THE que WITHIN question 1 OR question2
        $k1     = $objData->question1->ques;        //  EQUIVALENT TO: $q1->ques
        $k2     = $objData->question2->ques;        //  EQUIVALENT TO: $q2->ques

        // ACCESS THE optional ARRAY INSIDE OF question 1 OR question2
        $opt1   = $objData->question1->optional;    //  EQUIVALENT TO: $q1->optional
        $opt2   = $objData->question2->optional;    //  EQUIVALENT TO: $q2->optional

        var_dump($q1, $q2, $k1, $k2, $opt1, $opt2);


    ?>