Connecting to VCenter with PHP using REST API authentication error

问题

I followed the instructions in the official vsphere site to get info from the server and from the answer of another user here . From what I have understood, firstly I have to get the session id (cis id), but I got "null" as a result.

I tried multiple codes but the result is the same:

$ch = curl_init();

curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        $headers = array(
            'Content-Type: application/json',
            'Accept: application/json',
            'vmware-use-header-authn: test'
        );
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_URL, "https://vcsa/rest/com/vmware/cis/session");
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_USERPWD, 'administrator@vs.dom:userpassword');
        curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC );

$out = json_decode(curl_exec($ch));
// var_dump($out);
if ($out === false) {
    echo 'Curl Error: ' . curl_error($ch);
    exit;
}
$sid = $out;
        dd($out);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("vmware-api-session-id:$sid"));
curl_setopt($ch, CURLOPT_POST, 0);
curl_setopt($ch, CURLOPT_URL, "https://vcsa/rest/vcenter/vm");

$output = curl_exec($ch);
$vms = json_decode($output);
var_dump($vms);

curl_close($ch);

The result is null.

来源：https://stackoverflow.com/questions/59530068/connecting-to-vcenter-with-php-using-rest-api-authentication-error