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confusedofphp

Hi all,

Im very new to php. Currently im creating an online exam system which uses php and mysql as the database. I have registration and login page which works pretty fine. I had problem when it comes to question page. I have about 20 questions. As soon the user login to the system, he should start answering. The system should remember the number of correct answers til the 20th question. I used session to hold the value of number of correct answers. For example :

Login.php  login and redirect to ques1.php

ques1.php  first question, click submit to redirect to ques2.php

ques2.php  second question. Click submit to go to ques3.php or click back to return to ques1.php

The problem is when I click back button the counter which holds the value of correct answer doesn’t work properly.
Let say I’ve answered 3 questions correctly, the counter should show 3, then if click back button, it suppose become 2 but it doesn’t happen here. The counter increase becomes 4.

Code sample as below….

Expand|Select|Wrap|Line Numbers

  ques1.php

<html>

<head>

<title>Question 1 </title>

</head>

<body>

<form action="ques2.php" method="GET">

<font size="3" face="Verdana">

<?php

session_start();

echo "Current User : ".$_SESSION['name'];

?>

<br><br><b>Question 1</b><br><br>

</font>

<font size="2" face="Verdana">

What is HTML?<br><br>

<input type="radio" name="ques1" value="a"> Hyper Text Markup Language<br>

<input type="radio" name="ques1" value="b"> Hyper Transfer Markup Language<br>

<input type="radio" name="ques1" value="c"> Hyper Text Transfer Language<br><br>

<INPUT TYPE=SUBMIT VALUE="submit">

</form>

</body>

</html>
 
 ques2.php

<html>

<head>

<title>Question2</title>

</head>

<body>

<form action="ques3.php" method="GET">

<font size="3" face="Verdana">

<br><br><b>Question 2</b><br><br>

</font>

<font size="2" face="Verdana">

What is PHP?<br><br>

<input type="radio" name="ques2" value="a">Personal Home Page<br>

<input type="radio" name="ques2" value="b"> PHP Hypertext Preprocessor<br>

<input type="radio" name="ques2" value="c"> Personal Hypertext Processor<br><br>

<INPUT TYPE=SUBMIT VALUE="submit">

<input type="button" name="back" value="Back" onClick="history.go(-1);"><br>

</font>

</form>

<?php

require 'db.php';

session_start();

$counter=0;

$answer1=$_GET['ques1'];
 
$result=mysql_query("select ans from answer where qid='q1'");

$res=mysql_fetch_array($result);
 
if($answer1==$res["ans"])

{

    $counter=$counter+1;

    $_SESSION['ans']=$counter;

}

else

{

$_SESSION['ans']=$counter;

}

echo "Current User : ".$_SESSION['name']."<br>";

echo "Number of correct".$_SESSION['ans'];

?>

</body>

</html>
 
 ques3.php

<html>

<head>

<title>Question3</title>

</head>

<body>

<form action="ques4.php" method="GET">

<font size="3" face="Verdana">

<br><br><b>Question 3</b><br><br>

</font>

<font size="2" face="Verdana">

What is MySQL?<br><br>

<input type="radio" name="ques3" value="a">Markup Languange<br>

<input type="radio" name="ques3" value="b"> Programming Language<br>

<input type="radio" name="ques3" value="c"> Database<br><br>

<INPUT TYPE=SUBMIT VALUE="submit">

<input type="button" name="back" value="Back" onClick="history.go(-1);"><br>

</font>

</form>

<?php

require 'db.php';

session_start();

$answer2=$_GET['ques2'];

//$counter=$_SESSION['ans'];
 
$result=mysql_query("select ans from answer where qid='q2'");

$res=mysql_fetch_array($result);
 
if($answer2==$res["ans"])

{

    //$counter=$counter+1;

    $_SESSION['ans']++;

}

echo "Current User : ".$_SESSION['name']."<br>";

echo "Number of correct".$_SESSION['ans'];

?>

</body>

</html>

What should I change in my code?

Thank you.

developing

if you are storing the questions in a database, then you dont need a separate file for each question.

make one file called ques.php and use the same code. add a couple more GET/POST variables that identify

current question
user answer
current question number
next question

and maybe a few other things

this way it will be less work for you and way less maintenance for you in the future.

a better way to track counter would be to have an array (session variable) that associates the 'questions already asked' with the 'sequence number' they were asked in.

if the 'current question number' already exists in the said array, then display the 'sequence number' for it
else add the 'current question number to the array

back button

re: back button

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