How to validate an answer in radio button using php

[naveen212010]

when i am selecting a answer in a radio button of four options it only compares first option of all the options ,

the will have to see which answer is selected and verify that selected answer is correct or not and display corect if correct and display wrong if wrong 

example go to this link http://www.naveenr5.5gbfree.com/quiz.php?question=4

 

There are two tables named questions and answers questions table is 

 

questions table is 

            

                          id question_id question 

              1    1        question1
              2    2        question2

answers table is 

id question_id answer  correct

1      1       answer1  0
2      1       answer2  1
3      1       answer3  0
4      1       answer4  0

same for  second  question 

 

the php code iam using is here 

 

       

 

session_start();

require_once("scripts/connect_db.php");

$arrCount = "";

if(isset($_GET['question'])){

$question = preg_replace('/[^0-9]/', "", $_GET['question']);

$output = "";

$answers = "";

$q = "";

$dv="";

$dv2="";

 

 

$singleSQL = mysql_query("SELECT * FROM questions WHERE id='$question' LIMIT 1");

while($row = mysql_fetch_array($singleSQL)){

$id = $row['id'];

$thisQuestion = $row['question'];

$type = $row['type'];

$subject =$row['subject'];

$exam =$row['exam'];

$explan =$row['explan'];

$question_id = $row['question_id'];

$s ='<strong>'.$subject.'</strong>';

$e ='<small>'.$exam.'</small>';

$q = '<h2>'.$thisQuestion.'</h2>';

$ex ='<div id="welcomeDiv" style="display:none;" class="expl" >'.$explan.'</div>';

$sql2 = mysql_query("SELECT * FROM answers WHERE question_id='$question' ORDER BY rand()");

while($row2 = mysql_fetch_array($sql2)){

$id2=$row2['id'];

$answer = $row2['answer'];

$correct = $row2['correct'];      

$answers .= '<table class="table table-hover table-bordered"> <tr>

<td class="chk"><label style="cursor:pointer;"><input type="radio" name="rads" value="'.$correct.'">'.$answer.'</label></td>

</tr></table>

<input type="hidden" id="qid" value="'.$id.'" name="qid"><br />

';

 

         $result=mysql_query("SELECT id FROM answers WHERE question_id='$question' ");

 $nrows=mysql_num_rows($result);

 for($i=0;$i<=4;$i++){

if (isset($_POST[$correct])) {

            $answer= $_POST[$correct];

}

 

if($answer&&$correct==1){

 

echo $dv.='<div style="display:none;" class="green" id="chek" >Your answer '.$answer.'  is correct</div>';}

 

   else{

echo  $dv2.='<div style="display:none;" class="red" id="chek" >Your answer '.$answer.'  is worng</div>';}

 }

 

 

}

$output = ''.$s.','.$e.''.$q.','.$dv.''.$dv2.''.$answers.''.$ex.'<input type="button" name="answer" value="check" onclick="showDiv();chk();"/> <span ><button onclick="post_answer()" class="btn" >Submit</button></span>';

echo $output;

  }

}