sample-api/api/sample.php

<?php

header("Content-Type: application/json");

$response = [];
$response['content'] = 'Sample content, which is sending by REST api in JSON.';
$response['title'] = 'Sample';
$response['object'] = [];
$response['object']['x'] = 10;
$response['object']['y'] = 20;
$response['object']['z'] = 30;

echo(json_encode($response));