Question

我为我的学生做了一个简单的基于PHP的考试。结果记录为＆＃34; q1＆＃34;，＆＃34; q2＆＃34;，＆＃34; q3＆＃34;，＆＃34; q4＆＃34;和＆＃34; q5＆＃34;在数据库中。

正确答案记录为＆＃34;是＆＃34;并且错误答案为＆＃34; no＆＃34;。

有5个问题，我希望总分为100。

所有功能都可以像我一样工作，但问题是，我不知道如何将结果从高到低排序。任何帮助都非常感谢！

$result = mysqli_query($db,"SELECT * FROM table");
while($row = mysqli_fetch_array($result)){
    $score = 0;
    echo '<img alt="'.$row["name"].'" src="images/'.$row["name"].'.jpg"         width="118" height="158"';
    if ($row["q1"] === "yes") {$score=$score+20;}
    if ($row["q2"] === "yes") {$score=$score+20;}
    if ($row["q3"] === "yes") {$score=$score+20;}
    if ($row["q4"] === "yes") {$score=$score+20;}
    if ($row["q5"] === "yes") {$score=$score+20;}
    echo ' /> '.$row["name"] . ' ' . $score;
}

Answer 1

您可以使用while和if结果列执行所有操作，而不是select和内部order by，例如：

  select name, if(q1='yes', 20, 0) +
          if(q2='yes', 20, 0) +
          if(q3='yes', 20, 0) +
          if(q4='yes', 20, 0) +
          if(q5='yes', 20, 0) result  
  from  table 
  order by result desc

Answer 2

$result = mysqli_query($db,"SELECT * FROM table");
//I sugges you to first store the information into an array:
$scores = [];

while($row = mysqli_fetch_array($result)){
  $score = 0;
  //Calculate the score
  if ($row["q1"] === "yes") {$score=$score+20;}
  if ($row["q2"] === "yes") {$score=$score+20;}
  if ($row["q3"] === "yes") {$score=$score+20;}
  if ($row["q4"] === "yes") {$score=$score+20;}
  if ($row["q5"] === "yes") {$score=$score+20;}
  //Push it into the array
  array_push($scores,   array("name"   => $row["name"],
                              "image"  => 'src="images/'.$row["name"].'.jpg"',
                              "score"  => $score
                            ));

  }

对数组进行排序：（Sort Multi-dimensional Array by Value）

  usort($scores, function($a, $b) {
      return $b['score'] - $a['score'];
  });


  //Do as you wish with the array

  print_r($scores);

将考试成绩从最高到最低排序

2 个答案: