JSON语法混乱

Question

I am working with an api where I am retrieving JSON data. I've come across a data type that I am unfamiliar with and I would like some insight into what it means.

An example is shown below.

{     
   "data":{  
      "id":"92",
      "name":"harry",
      "friends":"a:2:{i:0;s:1:\"1\";i:1;s:2:\"15\";}"
      "enemies":"a:0:{}"
    },
   "error":false
}

I am unsure how to interpret the "friends" and "enemies" fields. I am aware that arrays are represented by [ ] and objects by { }.

Could anyone explain what they mean?

Thank you.

Answer 1

The fields contain arrays that have been serialized by PHP.

For example

<?php
  $friends = "a:2:{i:0;s:1:\"1\";i:1;s:2:\"15\";}";
  $arr = unserialize($friends);
  var_dump($arr);
?>

gives

array(2) { 
    [0]=> string(1) "1" 
    [1]=> string(2) "15"
} 

What these values represent will be application-specific.

Answer 2

The value of friends is a string with the value: a:2:{i:0;s:1:"1";i:1;s:2:"15";}

What this string represents depends on what the application does with it