从php到javascript获取JSON数据

Question

我已经使用json从数据库中选择了一些数据。 现在，我要提醒JavaScript中的数据。 我如何迭代使用json数据中的for循环来获取脚本中下面的数据。     

$json_array = array();

$sql = "SELECT id, instructions, quiz_question, correct, wrong, wrong1, wrong2 FROM student_quiz WHERE subject = 'SOCIAL STUDIES' AND type = 'challenge'";

$results = $pdo->query($sql);
$results->setFetchMode(PDO::FETCH_ASSOC);

while($row = $results->fetch()) {
    $json_array['quizlist'][] = $row ;
}

?>

    <script type='text/javascript'>



(function() {
  var questions = [{
    question: "What is 3*6?",
    choices: [3, 6, 9, 12, 18],
    correctAnswer: 4
  }, {
    question: "What is 8*9?",
    choices: [72, 99, 108, 134, 156],
    correctAnswer: 0
  }, {
    question: "What is 1*7?",
    choices: [4, 5, 6, 7, 8],
    correctAnswer: 3
  }, {
    question: "What is 8*8?",
    choices: [20, 30, 40, 50, 64],
    correctAnswer: 4
  }];

我需要帮助。