Peticiones HTTP post sin Curl

httpPostRequest.php

<?php

include('vendor/rmccue/requests/library/Requests.php');

Requests::register_autoloader();

$url = 'https://jsonplaceholder.typicode.com/posts';

$postData = array([
    'title' => 'Hola Mundo',
    'body' => 'Este es un ejemplo de envio con POST',
    'userId' => 1,
]);

$headers = array([
    'Content-type' => 'application/json; charset=UTF-8'
]);

$responsePost = Requests::post($url, null, $postData);

echo json_encode($responsePost);