check.php

<?php
require_once 'assets/config/config.php';
require_once "vendor/autoload.php";

use PhotoTech\ErrorHandler;
use PhotoTech\Database;
use PhotoTech\Trivia;

$errorHandler = new ErrorHandler();

// Register the exception handler method
set_exception_handler([$errorHandler, 'handleException']);

$database = new Database();
$pdo = $database->createPDO();

$trivia = new Trivia($pdo);

/*
 * The below must be used in order for the json to be decoded properly.
 */
try {
    $data = json_decode(file_get_contents('php://input'), true, 512, JSON_THROW_ON_ERROR);
    $result = $trivia->fetch_correct_answer($data['id']);
    output($result);
} catch (JsonException $e) {
}

/*
 * After converting data array to JSON send back to javascript using
 * this function.
 */

function output($output)
{
    http_response_code(200);
    try {
        echo json_encode($output, JSON_THROW_ON_ERROR);
    } catch (JsonException) {
    }
}