```php
PDO::ERRMODE_EXCEPTION,
PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
]
);
// =============================
// API
// =============================
if (isset($_GET['api'])) {
header('Content-Type: application/json; charset=utf-8');
// Получить вопрос
if ($_GET['api'] === 'question') {
$id = (int)($_GET['id'] ?? 1);
$stmt = $pdo->prepare("
SELECT id, question
FROM questions
WHERE id = ?
");
$stmt->execute([$id]);
$question = $stmt->fetch();
echo json_encode([
'question' => $question
], JSON_UNESCAPED_UNICODE);
exit;
}
// Обработать ответ
if ($_GET['api'] === 'answer') {
$data = json_decode(
file_get_contents('php://input'),
true
);
$questionId = (int)$data['question_id'];
$answer = (int)$data['answer'];
$stmt = $pdo->prepare("
SELECT
r.next_question_id,
r.diagnosis_id,
d.name AS diagnosis
FROM rules r
LEFT JOIN diagnoses d
ON d.id = r.diagnosis_id
WHERE r.question_id = ?
AND r.answer = ?
");
$stmt->execute([
$questionId,
$answer
]);
$rule = $stmt->fetch();
// Диагноз
if ($rule && $rule['diagnosis_id']) {
echo json_encode([
'type' => 'result',
'diagnosis' => $rule['diagnosis']
], JSON_UNESCAPED_UNICODE);
exit;
}
// Следующий вопрос
if ($rule && $rule['next_question_id']) {
$stmt = $pdo->prepare("
SELECT id, question
FROM questions
WHERE id = ?
");
$stmt->execute([
$rule['next_question_id']
]);
$question = $stmt->fetch();
echo json_encode([
'type' => 'question',
'question' => $question
], JSON_UNESCAPED_UNICODE);
exit;
}
echo json_encode([
'error' => 'Правило не найдено'
], JSON_UNESCAPED_UNICODE);
exit;
}
}
?>
Диагностика симптомов
Опросник по симптомам
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```