php - PHP 添加到会话

Question

我正在做一个在线测验，在这个测验中，一次问一个问题。如果答案是正确的，我想将这一点添加到获得的总分中。我希望 $_SESSION 显示用户到目前为止获得了多少积分。我到目前为止的代码是这样的：

$sql = "SELECT * FROM quiz_questions WHERE Question='$question' AND Answer='$answer'";
$result = mysql_query($sql);
$num_rows = mysql_num_rows($result);
if ($num_rows != 0){

    $score++;
    $total_score += $score;
    session_start();
    $_SESSION['score'] = $total_score;

} else {
    echo "Incorrect";
}
  }

我已经有 $score 等于 0 开始在代码的开头。预先感谢您的所有帮助！

Answer 1

session_start(); // should be at the beginning of your script(s);
if (!isset($_SESSION['score'])) { $_SESSION['score'] = 0; }


$sql = "SELECT * FROM quiz_questions WHERE Question='$question' AND Answer='$answer'";
$result = mysql_query($sql);
$num_rows = mysql_num_rows($result);


if ($num_rows != 0){

    // $row = fetch row to get the actual score for this question, if answered right?
    $row = mysql_fetch_row($result);

    //$score++; ??????
    //$total_score += $score;
    $_SESSION['score'] += $row['score_index'];
    //$_SESSION['score']++; // or just this, dunno
    echo 'Your current score is: '.$_SESSION['score'];
}
else {
    echo "Incorrect";
}