Curl PUT Request and empty request data (rest api) - cakephp-3.x

Question

I am trying to make a PUT request, in order to edit some user's data, but I am receiving empty data instead of what I'm sending through my request.
I have tried with postman (a chrome plugin) and with a custom php snippet:
?php
$process = curl_init('http://localhost/myapp/api/users/1.json');
$headers = [
'Content-Type:application/json',
'Authorization: Basic "...=="'
];
$data = [
'active' => 0,
'end_date' => '01/01/2018'
];
curl_setopt($process, CURLOPT_HTTPHEADER, $headers);
curl_setopt($process, CURLOPT_TIMEOUT, 30);
curl_setopt($process, CURLOPT_PUT, 1);
curl_setopt($process, CURLOPT_POSTFIELDS, $data);
curl_setopt($process, CURLOPT_RETURNTRANSFER, TRUE);
$return = curl_exec($process);
curl_close($process);
print_r($return);
This is the code that I'm using cakephp-side:
class UsersController extends AppController
{
public function initialize()
{
parent::initialize();
$this->loadComponent('RequestHandler');
}
....
public function edit($id = null)
{
debug($_SERVER['REQUEST_METHOD']);
debug($this->request->data);
die;
}
....
And this is what it outputs:
/src/Controller/UsersController.php (line 318)
'PUT'
/src/Controller/UsersController.php (line 319)
[]
I am confused... similar code is working for a POST request and the add action... what is wrong with this code?

Answer 1

Two problems.
When using CURLOPT_PUT, you must use CURLOPT_INFILE to define the data to send, ie your code currently doesn't send any data at all.
CURLOPT_PUT
TRUE to HTTP PUT a file. The file to PUT must be set with CURLOPT_INFILE and CURLOPT_INFILESIZE.
http://php.net/manual/en/function.curl-setopt.php
You are defining the data as an array.
CURLOPT_POSTFIELDS
[...] If value is an array, the Content-Type header will be set to multipart/form-data.
http://php.net/manual/en/function.curl-setopt.php
So even if the data would be sent, it would be sent as form data, which the request handler component wouldn't be able to decode (it would expect a JSON string), even if it would try to, which it won't, since your custom Content-Type header would not be set unless you'd pass the data as a string.
Long story short, use CURLOPT_CUSTOMREQUEST instead of CURLOPT_PUT, and set your data as a JSON string.
curl_setopt($process, CURLOPT_CUSTOMREQUEST, 'PUT');
curl_setopt($process, CURLOPT_POSTFIELDS, json_encode($data));
Your Postman request likely has a similar problem.