Simple Api on Pure PHP - Without frameworks

simple_php_api.php

<?php
init_set('display_errors', 0);
init_set('html_errors', 0);

$message = new stdClass();
$message->content[0] = "Hi there!";
$message->content[1] = "See you later";

/** Headers Response **/
header('Content-Type: application/json; charset=utf-80); // response tpye
header('HTTP:1.1 200 OK'); // status code

echo json_encode($message);
exit();