Using a cookie to count the amount of correct answers from a radio button quiz..

gdanelian · November 28, 2008

Hello everyone, thank for your time.

I am creating a php quiz. The first page has question 1 on it with 4 answers as radio buttons. On answering the user is directed to the second page (quiz2.php) where their answer is printed and the second question is given (this carries on until the user has answered all 5 questions). I want to create a cookie that keeps track of their correct answers and I also want to print their score out on the final page. I am totally new to cookies with php...all help welcome! Thanks

rhodesa · November 28, 2008

#1 Using cookies is fine, but be aware that people can edit their cookies. If this is just a game for fun, then cookies are fine, but if you want to remove that flaw, use SESSIONS

For using cookies, there are only a couple things to know. setcookie() writes a value to the cookie. To read the value back, get it from the global variable $_COOKIE. But, the main thing to remember is that after setcookie(), the value won't be in $_COOKIE until the next time a page loads.

gdanelian · November 28, 2008

ok thank you. But how to get the cookie to first of all add 1 to the score if it is the correct answer and then if the user answers correctly again add 1 again? I am really confused as to how to set this up...please help

rhodesa · November 28, 2008

well...you probably don't want to keep a 'count' in the cookie, because if they go back, and answer again, it will increase the value again. instead, keep a 1 or 0 for each question, then add them up.

//At this point of the script, i assume the question # (1,2,3 or 4) is in $num
//and $correct is set to 1 or 0 depending on if they go the answer correct

//Load old answers
$answers = array();
for($n = 1;$n <= 4;$n++){
  if(isset($_COOKIE['q'.$n]) && $_COOKIE['q'.$n])
    $answers[$n] = 1;
}
//Add new answer
$answers[$num] = $correct;
setCookie('q'.$num,$correct);
//Get their score
$score = array_sum($answers);

gdanelian · November 28, 2008

THIS IS THE FIRST PAGE OF THE QUIZ

<%@LANGUAGE="JAVASCRIPT" CODEPAGE="65001"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>

<!--

body,td,th {

color: #FFF;

}

body {

background-color: #000;

}

</style></head>

<body>

<a href='' onMouseOver='window.alert("The correct answer is either PHP or CSS, good luck")'>Would you like a 50/50?</a>

<?php

?>

<p align="center">WELCOME TO MY COURSEWORK QUIZ...</p>

<p align="center"><strong>Question One: Which os the following was originally designed for producing dynamic web pages </strong></p>

<div align="center">The Universe

XHMTL <input type="radio" name="ANSWER" value="XHMTL" > <br>

CSS <input type="radio" name="ANSWER" value="CSS" > <br>

PHP <input type="radio" name="ANSWER" value="PHP" > <br>

</div>

</form>

</body>

</html>

IF THEY ANSWER CORRECTLY I WANT TO INCREASE A SCORE COUNTER IN A COOKIE AND PRINT THE RESULTS ON THE LAST PAGE. I assume that I have toset the cookie at the start of page 2? Here is page 2. I reall appreciate your help but I am just starting with cookies!

<%@LANGUAGE="JAVASCRIPT" CODEPAGE="65001"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>

<!--

body {

background-color: #000;

}

body,td,th {

color: #FFF;

}

-->

</style></head>

<body>

<a href='' onMouseOver='window.alert("The correct answer is not Mars, good luck")'>Would you like a 50/50?</a>

echo "Your answer is ", $_REQUEST['ANSWER'];

if ($_REQUEST['ANSWER'] == "PHP")

{

echo ("<br>Correct, Well done</br>");

}

else

{

echo ("<br>Incorrect</br>");

}

?>

</div>

<p align="center">The next question...</p>

<p align="center"><strong>Question Two. Which is the following is a group of interrelated web development techniques used for creating interactive web applications or rich Internet applications: </strong></p>

<div align="center">Michael Jackson <input type="radio" name="ANSWER" value="Michael Jackson" > <br>

Flash <input type="radio" name="ANSWER" value="Flash" > <br>

AJAX <input type="radio" name="ANSWER" value="AJAX" > <br>

Mars <input type="radio" name="ANSWER" value="Mars" > <br>

</div>

</form>

</body>

</html>

I am so so confused.

Before I set the cooke surely I need to set a score variable e.g. $score

If the user answers the first question correctly then $score = $score +1

if ($answer=="php")

{

($score = $score +1)

}

else

{

$score =$score

}

Then I need to pass the new score value into the next page for it to be added to if the user answers correctly?

THANK YOU SO MUCH, please keep helping me

rhodesa · November 28, 2008

on quiz2.php try this:

<?php
$num = 1;
$correct = 0;
if($_GET['ANSWER'] == "PHP")
  $correct = 1;

//Load old answers
$answers = array();
for($n = 1;$n <= 4;$n++){
  if(isset($_COOKIE['q'.$n]) && $_COOKIE['q'.$n])
    $answers[$n] = 1;
}
//Add new answer
$answers[$num] = $correct;
setCookie('q'.$num,$correct);
//Get their score
$score = array_sum($answers);

?>
<%@LANGUAGE="JAVASCRIPT" CODEPAGE="65001"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<html>
<head><title>The Quiz</title> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><style type="text/css">
<!--
body {
   background-color: #000;
}
body,td,th {
   color: #FFF;
}
-->
</style></head>
<body>
<a href='' onMouseOver='window.alert("The correct answer is not Mars, good luck")'>Would you like a 50/50?</a>
<div align="center">
<?php
echo "Your answer is ". $_GET['ANSWER'] . "<br>";
echo "So far, your score is ".$score."<br>";

if ($correct)
{
   echo ("<br>Correct, Well done</br>");
}
else
{
   echo ("<br>Incorrect</br>");
}
?>
</div>
<form action="http://www.0000000ac.uk/~08007934/php/quiz3.php" method="get">
<p align="center">The next question...</p>
<p align="center"><strong>Question Two. Which is the following is a group of interrelated web development techniques used for creating interactive web applications or rich Internet applications: </strong></p>
<div align="center">Michael Jackson <input type="radio" name="ANSWER" value="Michael Jackson" > <br>
  Flash <input type="radio" name="ANSWER" value="Flash" > <br>
  AJAX <input type="radio" name="ANSWER" value="AJAX" > <br>
  Mars <input type="radio" name="ANSWER" value="Mars" > <br>
  <input type="submit" value="SUBMIT YOUR ANSWER">
</div>
</form>
</form>
</body>
</html>

gdanelian · November 28, 2008

You are awesome! I am going to try this and report back. THANK YOU SO MUCH! Best Wishes

gdanelian · November 28, 2008

Hello again, I tested the code you gave me for the quiz

On the 5th and final page I use

echo $score;

Unfortunately it print '0' no matter how many correct answers I give. I took the following code out of the second page:

//Load old answers

$answers = array();

for($n = 1;$n <= 4;$n++){

if(isset($_COOKIE['q'.$n]) && $_COOKIE['q'.$n])

$answers[$n] = 1;

}

And the score became '1'

On the 5th page I want to print the number of correct answers...is there anymore help going? I can't believe how kind you have been so far!!! Thanks

gdanelian · November 28, 2008

FIXED! Instead of looking at your code I read it and attempted to understand what was going on... that helped me!

How can I thank you enough?!

revraz · November 28, 2008

I'm sure he'll take beer or women.

rhodesa · November 28, 2008

I'm sure he'll take beer or women.

true that

gdanelian · December 1, 2008

Hello again! I am still having trouble getting the cookie to work.

Do I have to change any part of the cookie code for different pages? i.e. on page two do I have to change something in the cookie?

Also what if the user presses the back button and answers again...will this mess the cookie up.

Finally can you tell me what the different parts of the cookie code mean?

<?php

$num = 1;

$correct = 0;

if($_GET['ANSWER'] == "PHP")

$correct = 1;

//Load old answers

$answers = array();

for($n = 1;$n <= 4;$n++){

if(isset($_COOKIE['q'.$n]) && $_COOKIE['q'.$n])

$answers[$n] = 1;

}

//Add new answer

$answers[$num] = $correct;

setCookie('q'.$num,$correct);

//Get their score

$score = array_sum($answers);

?>

Also does the cookie need to be on all the pages including page one?

Sorry to be such a pain!!! Thank you

rhodesa · December 1, 2008

If the pages are in different directories, you will run into one problem. But I fixed that in the code below.

If they press the back button, and answers again, it will only change that question. That is why I did the more complicated array instead of just a count.

The cookie code only needs to be on pages that need it.

<?php
//This is the question number to be updated. So it isn't THIS question number, but
//actually the LAST one. So on quiz2.php it would 1, on quiz3.php it would be 2, etc.
$num = 1;

//This is just initiating the variable...leave it alone
$correct = 0;

//Here is the answer test. Again, this is for the LAST question.
if($_GET['ANSWER'] == "PHP"){
  $correct = 1; //If it was correct, we change this variable to 1
}

//This initiates the array that will hold which answers they got correct
//The key will be the question number and the value will be 1 or 0
$answers = array();

//Load old answers from the cookies. This loops from 1 to 4, checks if the
//cookie q# (# being the number 1 to 4) is set. I removed the second part
//that i had before because it wasn't doing anything useful. If the cookie
//exists, it puts the value (1 or 0) into the q# key of the answers array
for($n = 1;$n <= 4;$n++){
  if(isset($_COOKIE['q'.$n]))
    $answers[$n] = 1;
}

//Add new answer. Now that the old answers are loaded, we need to update
//the answer that was just submitted. $num is the question number and $correct
//1 or 0 (we set these above)
$answers[$num] = $correct;
setCookie('q'.$num,$correct,0,'/');
//For setCookie:
//First argument is q#, which is the name of the cookie.
//Second argument is 1 or 0, which is the value of the cookie
//Third argument is the lifetime of the cookie, 0 means the cookie will last until the browser is closed
//Fourth argument is the path of the cookie, '/' means the cookie being set can be accessed by any page on this host

//Get their score. Now that the $answers array is complete, we can just sum it.
//Since every correct answer is 1, the sum will give the number of correct answers
$score = array_sum($answers);

?>

gdanelian · December 1, 2008

Thank you very much for the explanation it makes a lot more sense now. However it does not work correctly.

If you answer the questions incorrectly it is still adding to the score. It works fine if you answer them all correctly...top score is 5, well done etc.

Am i a) use the wrong echo (I am using echo "Your current score = "; // echo $score;)

Or b) is the cookie just adding 1 anyway despite it being set to only add one if correct.

Thanks yet again.

Ill try and get the beer and girls over to you asap...

rhodesa · December 1, 2008

At the end of that PHP code, put this:

print "Answers so far:<pre>".print_r($answers,1)."</pre>";

what does it say after answering a question wrong?

gdanelian · December 1, 2008

PAGE 2:

Your answer is The Universe

Incorrect

Your current score = 0Answers so far:

Array

(

[1] => 0

)

PAGE 3:

Your answer is Michael Jackson

Incorrect

Your current score = 1Answers so far:

Array

(

[1] => 1

[2] => 0

)

PAGE 4:

Your answer is Toast

Incorrect

Your current score = 2Answers so far:

Array

(

[1] => 1

[2] => 1

[3] => 0

)

PAGE 5:

Your answer is George W Bush

Incorrect

Your current score = 3Answers so far:

Array

(

[1] => 1

[2] => 1

[3] => 1

[4] => 0

)

FINAL PAGE:

Your answer is Monitor

Incorrect!!!

Your final score = 4Answers so far:

Array

(

[1] => 1

[2] => 1

[3] => 1

[4] => 1

[5] => 0

)

!? thank you (again!)

gdanelian · December 1, 2008

I put this back in and it works a dream! :

) && $_COOKIE['q'.$n])

what does this extra bit mean?

Cheers!

rhodesa · December 1, 2008

wow...DUH....update this block:

for($n = 1;$n <= 4;$n++){
  if(isset($_COOKIE['q'.$n]))
    $answers[$n] = $_COOKIE['q'.$n];
}

it was always setting it to 1 instead of using the value in the cookie

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Using a cookie to count the amount of correct answers from a radio button quiz..

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