What is the correct way to send JSON POST request?

Question

PHP

Good afternoon. Sending a JSON POST request and getting an empty response as a result. Can you tell me how to submit a request?

$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json;', 'Content-Length: ' . strlen(json_encode($params))));
curl_setopt($ch, CURLOPT_POST, 1);

$data_string = urlencode(json_encode($params));
curl_setopt($ch, CURLOPT_POSTFIELDS, array("data"=>$data_string));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

$result = curl_exec($ch);
die(var_dump($result));
curl_close($ch);

Answer 1

Remove urlencode

Answer 2

curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);

curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query(array("data"=>$data_string)));