Question

  <?php
     include "connect.php";
     session_start();
     $servedQuestions = array(0);
     $c="SELECT * from `qa`;";
     $r=mysqli_query($conn,$c);
     $count=mysqli_num_rows($r);
     while(count($servedQuestions) <= 5) {
        $n1 = mt_rand(1,$count);
        if (in_array($n1, $servedQuestions))
          continue;
        $servedQuestions[] = $n1;
     }
     $selected=[];
     for($i=1;$i<count($servedQuestions);$i++){
       echo "<br>";
       $get_question="SELECT * from `qa` WHERE qno = 
                        `'".$servedQuestions[$i]."';"; 
       $result=mysqli_query($conn,$get_question);
       $row=mysqli_fetch_array($result);
       $qno=$row['qno'];
       $question=$row['question'];
       $opt1=$row['opt1'];
       $opt2=$row['opt2'];
       $opt3=$row['opt3'];
       $opt4=$row['opt4'];
       echo "QUESTION: $i <br>&nbsp<br>";   
       echo"$question <br><br> "; 
       echo"<input type='radio'name='response[$qno]'value='1'>$opt1<br> "; 
       echo"<input type='radio' name='response[$qno]' value='2'>$opt2<br> ";
       echo"<input type='radio' name='response[$qno]' value='3'>$opt3 <br>";
       echo"<input type='radio' name='response[$qno]' value='4'>$opt4<br>"; 
       echo "<br>";
       $v=$_POST['response['.$qno.']'];
       echo $v;
   ?>

初始代码为这些数字生成5个随机数，显示5个随机问题。当我试图回显单选按钮的值时，它说未定义索引.im无法打印单选按钮的值。

Answer 1

而不是命名您的单选按钮，如：

<input type='radio'name='response[$qno]'value='1'>$opt1<br>

您可以这样命名：

<input type='radio'name='$qno_response'value='1'>$opt1<br>

在后端（php），您可以访问单选按钮：

for($i=1;$i<count($servedQuestions);$i++)//Or you can have your own way of getting the list of questions generated
{
  $QuestionAnswer = $_POST[$qno.'_response'];
 //This will work like:
 //$QuestionAnswer = $_POST['1_response']; //for first question
 //$QuestionAnswer = $_POST['2_response']; //for second question and so on..
}

在线检查如何在php中显示多个问题时存储单选按钮值

1 个答案: