当字符串包含“＆”符号时，Json_decode抛出一个空数组

I have a problem with the json_decode() when passed string contain "&". When mobile app send a request as a post containing this type of a UTF encoded string:

[
  {
    "mobile": [
      "123456"
    ],
    "full_name": [
      "Bride&Groom"
    ]
  }

json_decode() a null array. This happens when only send the request through the mobile end. specific scenario? We are using Laravel 5.

Request taken like this $friendDetails = $request->friend then pass the variable through json_decode

$decodedFriend = json_decode($friendDetails ,true);

As headers we are using Oauth and header values are like this.

Authorization Bearer <token>

Content type is application form data

Thanks in advance

I just tried with json_decode function and the string you gave as example is perfectly decoded to:

object(stdClass)#1 (2) {
  ["mobile"]=>
  array(1) {
    [0]=>
    string(6) "123456"
  }
  ["full_name"]=>
  array(1) {
    [0]=>
    string(11) "Bride&Groom"
  }
}

Consider adding a MCVE