未定义变量在$ a，$ b，$ c和$ d

Question

我正在做在线aptitude测试，它将从数据库中挑选2个随机问题，并将其显示在网页上进行回答。

下面的代码是从候选人获得答案（简单的演示只提取2个随机问题）。

$nbQuestion = 2; 
$form = '<form id="form1" name="quest" method="POST" action="" >'; 
$form .= getQuestion("SELECT * FROM `microsoftq` ORDER BY RAND() LIMIT ".$nbQuestion); 
$form .= '<input type="submit" id="submit_id" name="SUBMIT" value="SUBMIT"></form>'; 

// Save answer 
if (isset($_POST['SUBMIT'])) 
{ 
    for($i=1;i<=$nbQuestion;$i++){ 
     saveAnswer($i); 
    } 
} 
function getQuestion($query){ 
    $question = ""; 
    $i = 1; 
    $result = mysql_query($query); 
    while ($row = mysql_fetch_object($result)) { 
     $question .= "<b>Question:-<br></b>".$row->Question." <br><br>"; 
     $question .= "<input type='hidden' name='q".$i."' value='".$row->QNo."'>"; 
     $question .= "<input type=radio name = 'answer".$row->QNo."' value = '".$row->Opt1."'></input>$a1 &nbsp &nbsp<br>"; 
     $question .= " <input type=radio name = 'answer".$row->QNo."' value = '".$row->Opt2."'></input>$b1 &nbsp &nbsp<br>"; 
     $question .= " <input type=radio name = 'answer".$row->QNo."' value = '".$row->Opt3."'></input>$c1 &nbsp &nbsp <br>"; 
     $question .= " <input type=radio name = 'answer".$row->QNo."' value = '".$row->Opt4."'></input>$d1 <br><br> "; 
     $i++; 
    } 
    mysql_free_result($result); 
} 
function saveAnswer($nb){ 
    $qId=$_POST["q".$nb]; 
    if (is_numeric($qId)) { 
     $query = mysql_query("SELECT * FROM `microsoftq` WHERE QNo=".$qId); 
     $rows1 = mysql_fetch_array($query); 
     $ans = $rows1['Ans']; 
     $opt = $_POST["answer".$qId]; 
     if($ans==$opt) 
     { 
      $val="ct"; 
     } 
     else 
     { 
      $val="wg"; 
     } 
     mysql_query("insert into $username values('$qId','$opt','$val')") 

     //$username getting from previous page, pls dont worry about it,.. 

     or die(mysql_error()); 
    } 
} 

我收到错误未定义变量在$ a，$ b，$ c和$ d。

Answer 1

您不再需要使用这些变量（根据您以前的问题之一）。相反替换此：

$question .= " <input type=radio name = 'answer".$row->QNo."' value = '".$row->Opt1."'></input>$a1 &nbsp &nbsp<br>"; 
$question .= " <input type=radio name = 'answer".$row->QNo."' value = '".$row->Opt2."'></input>$b1 &nbsp &nbsp<br>"; 
$question .= " <input type=radio name = 'answer".$row->QNo."' value = '".$row->Opt3."'></input>$c1 &nbsp &nbsp <br>"; 
$question .= " <input type=radio name = 'answer".$row->QNo."' value = '".$row->Opt4."'></input>$d1 <br><br> "; 

与此：

$question .= " <input type=radio name = 'answer".$row->QNo."' value = '".$row->Opt1."'></input>".$row->Opt1." &nbsp &nbsp<br>"; 
$question .= " <input type=radio name = 'answer".$row->QNo."' value = '".$row->Opt2."'></input>".$row->Opt2." &nbsp &nbsp<br>"; 
$question .= " <input type=radio name = 'answer".$row->QNo."' value = '".$row->Opt3."'></input>".$row->Opt3." &nbsp &nbsp <br>"; 
$question .= " <input type=radio name = 'answer".$row->QNo."' value = '".$row->Opt4."'></input>".$row->Opt4." <br><br> "; 

我希望这有助于。