function queryByCondition() { $subject = $_POST['subject']; $type = $_POST['type']; $difficulty = $_POST['difficulty']; $keyword = $_POST['keyword']; include '../dao/QuestionDaoImpl.php'; $questionDao = new QuestionDaoImpl(); $questions = $questionDao->queryByCondition($subject, $type, $difficulty, $keyword); session_start(); $_SESSION['questions'] = $questions; header('Location: /teacher/question.php'); }