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<?php
session_start();

require 'database.php';

$data = json_decode(file_get_contents("php://input"), true);
$questionIndex = $data['questionIndex'];
$userAnswer = $data['answer'];
$listId = $data['listId'];
$languageMode = isset($data['languageMode']) ? (int)$data['languageMode'] : 0;

$stmt = $pdo->prepare("SELECT questions, answers FROM lists WHERE id = ?");
$stmt->execute([$listId]);
$list = $stmt->fetch(PDO::FETCH_ASSOC);

$questions = json_decode($list['questions'], true);
$answers = json_decode($list['answers'], true);

$response = [];

if ($languageMode === 1) {
    $tempQuestions = $questions;
    $questions = $answers;
    $answers = $tempQuestions;
}

if (isset($answers[$questionIndex]) && strtolower($userAnswer) === strtolower($answers[$questionIndex])) {
    $response['message'] = "Correct!";
    $response['correct'] = true;
} else {
    $response['message'] = "Onjuist, probeer het opnieuw.";
    $response['correct'] = false;
}

header('Content-Type: application/json');
echo json_encode($response);

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