Composer con jwt

<?php
//Cargamos los módulos de Composer
require __DIR__ . '/vendor/autoload.php';
// A continuación, ya podremos usar Composer
use \Firebase\JWT\JWT;

$token = array (
  'sub' => '1234567890',
  'name' => 'John Doe',
  'admin' => true,
  'jti' => '79f6c158-7c50-4943-b2dd-e6817f3ee274',
  'iat' => 1571252215,
  'exp' => 1571255815,
);

$jwt = JWT::encode($token, "secret");
echo $jwt;
?>