使用PHP和cURL构建动态JSON Dict

Question

I was wondering how I could merge the variables at the top of my PHP file with the dict in my cURL POST method.

$first_name = $_POST['first_name'];
$last_name = $_POST['last_name'];
$email = $_POST['email'];
$comment = $_POST['comment'];

curl_setopt_array($curl, array(
      CURLOPT_URL => "CUSTOM_URL",
      CURLOPT_RETURNTRANSFER => true,
      CURLOPT_ENCODING => "",
      CURLOPT_MAXREDIRS => 10,
      CURLOPT_TIMEOUT => 30,
      CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
      CURLOPT_CUSTOMREQUEST => "POST",
      CURLOPT_POSTFIELDS => "{\"email_address\": \"[e-mail]\", \"status\": \"subscribed\", \"merge_fields\": {\"FNAME\": \"Bob\", \"LNAME\": \"Dylan\"}}",
      CURLOPT_HTTPHEADER => array(
        "authorization: Basic UN:PW",
        "cache-control: no-cache",
        "content-type: application/json",
      ),
    ));

So essentially, how do I put First Name, Last Name, Email, etc into "{\"email_address\": \"[e-mail]\", \"status\": \"subscribed\", \"merge_fields\": {\"FNAME\": \"Bob\", \"LNAME\": \"Dylan\"}}" (to replace [e-mail], Bob, etc.)

Answer 1

Use json_encode.

$data = [
    'email_address' => $_POST['email'],
    'status' => 'subscribed',
    'merge_fields' => [
        'FNAME' => $_POST['first_name'],
        'LNAME' => $_POST['last_name'],
    ],
];

...
CURLOPT_POSTFIELDS => json_encode($data),
...