I intend to use the api for a link shortening service, the api address for this site is as follows:
http://mitly.ir/api.php
And for example for this request:
http://mitly.ir/api.php?url=https://google.com
This outputs json:
{
    "longurl": "https:\/\/google.com",
    "shorturl": "http:\/\/mitly.ir\/12MxP",
    "stats": "http:\/\/mitly.ir\/stats.php?id=12MxP"
}
Now I wrote the following code to use this api, but unfortunately the output that returns to me is null:
//API Url
  $url = 'http://mitly.ir/api.php';
  //Initiate cURL.
  $ch = curl_init($url);
  //Tell cURL that we want to send a POST request.
  curl_setopt($ch, CURLOPT_POST, 1);
  curl_setopt($ch, CURLOPT_HEADER, false);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_POSTFIELDS, "url=https://google.com");
  curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/x-www-form-urlencoded'));
  //Execute the request
  $result = curl_exec($ch);
  //echo $result;
  $response = json_decode($result, true);
  var_dump($response);
  echo "your url is :".$response['result']['shorturl'];
Please help me solve this problem