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我正在制作成绩册，虽然下面的代码有效，但速度非常慢。表格的第一列是每个学生的姓名，然后每个单元格后面对应一个特定的问题，并显示学生的答案是什么。不是每个学生都会回答给定的问题。

现在我有一个循环，对于每个用户，每个问题在该循环内都有一个循环。

每个问题都有一个唯一的 ID，在单独的表中每个答案都有一个相应的用户 ID 和一个相应的问题 ID。

我一直在寻找类似的帖子，但没有运气，我只使用 php 几个月，所以任何建议都将不胜感激。

问题

| 编号 | 问题 | 选择1 | 选择2 | 选择3 | 选择4 | 正确答案 | 类别 ID |

答案

| 编号 | 问题ID | 用户名 | 学生回答 |

用户

| 编号 | 名字 |

谢谢

//Select all questions from a specific category $mid defined by user
    $questionQuery = mysql_query("SELECT * FROM questions WHERE mid = $mid");
    $questionCount = mysql_num_rows($questionQuery);

        //Blank space in table above users
            echo "<tr><td></td>";

            //Question Number, each category has a different number of questions
            for ($q = 0; $q < $questionCount; $q++){
                echo "<td>" . ($q+1) . "</td>";
            }

            echo "</tr>";


    //Select all students for a given teacher
    $userQuery = mysql_query("SELECT * FROM users WHERE teacherId = $userid ORDER BY `block`, `lastName`");
    $userCount = mysql_num_rows($userQuery);

        for($s = 0; $s < $userCount; $s++){
            $currentUserId = mysql_result($userQuery, $s, 0);

                //Echo student's name
                echo "<tr class='user" . ($s%2) ."'><td>" . mysql_result($userQuery, $s, 1) . "</td>";


                //Load current question id
                for ($q = 0; $q < $questionCount; $q++){
                    $questionNum = mysql_result($questionQuery, $q, 0);

                    //Selects students answer from answers database for above question
                    $answerQuery = mysql_query("SElECT * FROM answers WHERE questionId = $questionNum AND userId = $currentUserId");
                    $answerCount = mysql_num_rows($answerQuery);

                        //If no answers move on to next cell
                        if($answerCount == 0){
                            echo "<td></td>";
                        }
                        else{
                            $currentAnswer = mysql_result($answerQuery, 0, 3);
                            $correctAnswer = mysql_result($questionQuery, $q, 6);

                        if ($currentAnswer == $correctAnswer){
                            echo "<td class='right'><div id='parent'>" . $currentAnswer . "</div></td>";
                        }
                        else{
                            echo "<td class='wrong'><div id='parent'>" . $currentAnswer . "</div></td>";
                        }
            }
                   }
                   echo "</tr>";
      }
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