php - How to validate input from database -


i develop captcha require user answer question randomly display. database consist of id,question,answer. problem although enter correct answer still redirected me error.php instead of success.php. 

<?php    $database_db="test2";  $user_db="root";  $password_db="";  $host_db="localhost";    $link = mysqli_connect($host_db, $user_db, $password_db, $database_db);    /* check connection */  if (mysqli_connect_errno())   {      die ("couldnot connect: ".mysqli_connect_error());      exit();  }     if (array_key_exists("answer", $_post) , array_key_exists("question", $_post))  {      $id = intval($_post['question']);      $sql="select question, answer captcha question='$id' ,              answer='".mysqli_real_escape_string($link, $_post['answer'])."'";      $result = mysqli_query($link, $sql)  or exit('$sql failed: '.mysqli_error($link));       $num_rows = mysqli_num_rows($result);      if($num_rows > 0)      {          header("location: success.php");      }       else       {          header("location: error.php");      }      exit;  }  else  {      $query = "select id, question `captcha` order rand() limit 1";      if ($result = mysqli_query($link, $query))      {          if ($row = mysqli_fetch_assoc($result))           {              $id = $row["id"];              $question = $row["question"];          }      }   }     ?>  <html>  <body>      <form method="post">          <?php echo $question; ?><br />          <input type="hidden" name="question" id="question" value="<?php echo $id; ?>" />          <input type="text" name="answer" id="answer" /><br />          <input type="submit" name="submit" value="submit" /><br />         </form>      </body>  </html>

it looks you're querying wrong column match $id:

"select question, answer captcha question='$id' , ... "

i think should be:

"select question, answer captcha id='$id' , ... "

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