Looking to create an online Quiz

doctor-Eggman · March 7, 2010

You know something that I can set some questions and the PHP will tally up all the answers and give me a percentage based on how many were correct. Does anyone have something like that they can help me with?

gamblor01 · March 7, 2010

Sounds like you need to create a form in HTML and send the answers to some other page via an array. Then just loop through the array and compare to the array which stores the correct answers and increase a counter every time the values in the arrays match.

Once you're done just divide the number correct by the size of the array and you'll have your percentage. If there is some specific portion of code that you need help with then let us know.

jl5501 · March 7, 2010

You also need to decide if you are going to show all the questions on the screen at once, or 1 at a time with a time limit

ohdang888 · March 8, 2010

http://lmgtfy.com/?q=online+quiz+php+tutorial

Rustywolf · March 8, 2010

if($question == "answer")
{
$num++;
}

do taht for every question.

then to get a percentage

$num = $num / 100;
$num = $num * $question_amount;

Now $num should be the percentage.

$question_amount is the amount of questions

doctor-Eggman · March 10, 2010

} else {

$num = (int) $_POST['num'];

$postedanswers = str_replace("_"," ",$_POST['answers']);

if ($postedanswers == $answers[$num]['0']) {

$_SESSION['score']++;

$_SESSION['correct'][] = $postedanswers;

} else {

$_SESSION['wrong'][] = $postedanswers;

}

if ($num < count($questions)-1) {

$num++;

} else {

$last = true;

$_SESSION['finished'] = 'yes';

}

I took that dudes advice and looked on google and got some good code that does what I want. Problem is, it only makes a score out of 10. I want to change it to a percentage. I really am awful at PHP and could use a hand. I think that is the stuff making the answer, how could I make it display a percentage?

Daniel0 · March 10, 2010

Problem is, it only makes a score out of 10. I want to change it to a percentage.

"Percent" means "per hundred", so what do you think you need to do?

[math]\frac{1}{100} = 0.01 = 1\%[/math]

doctor-Eggman · March 10, 2010

Jeez you are really calling out that I am a dope here haha.

I really am stuck. Is that even the right code I put? I am not sure what to do

doctor-Eggman · March 11, 2010

was that even the right code I put? I am really bad at this.

salathe · March 11, 2010

was that even the right code I put?

No.

doctor-Eggman · March 11, 2010

Damn that was the only code I thought looked like it was scoring up the answers. I even looked at the tutorial i used and it said it was. I can think what else it would be. Is there any code like hints I should be looking for?

doctor-Eggman · March 11, 2010

Ok I think I know what you were saying before. Instead of the marks going up by 1. I need to say find out what one percent of 20 is and make it go up by that right? Right now when the score goes up, it goes up by one at a time. I need it to go up by .20 or something. Problem is I cant seem to find whats making it go up by 1. Here is all the code from the test page. If ANYONE can help I will be insanely grateful.

	$_SESSION['user'] = $username;
	$_SESSION['score'] = 0;
	$_SESSION['correct'] = array(); 
	$_SESSION['wrong'] = array();
	$_SESSION['finished'] = 'no';
	if (isset($_SESSION['error']))
	unset($_SESSION['error']); 
	$num = 0;
} else {
	$random = rand(1,1000);
	$_SESSION['user'] = 'Anon'. $random;
	$_SESSION['score'] = 0;
	$_SESSION['correct'] = array(); 
	$_SESSION['wrong'] = array(); 
	$_SESSION['finished'] = 'no';
	$num = 0;
}
} else {
$num = (int) $_POST['num'];
$postedanswers = str_replace("_"," ",$_POST['answers']);
if ($postedanswers == $answers[$num]['0']) {
	$_SESSION['score']++;
	$_SESSION['correct'][] = $postedanswers; 
} else {
	$_SESSION['wrong'][] = $postedanswers;
} 
if ($num < count($questions)-1) {
	$num++;
} else {
	$last = true;
	$_SESSION['finished'] = 'yes';
}/php]

[code=php:0]<?php } else { 
$file = "leaders.xml";
$xml = simplexml_load_file($file);
$user = $xml->addChild('user');
$uname = $user->addChild('name',$_SESSION['user']);
$uscore = $user->addChild('score',$_SESSION['score']);
$xml->asXML("leaders.xml");

echo "<h2 id=\"score\">{$_SESSION['user']}, your final score is:</h2>\n
<h3>{$_SESSION['score']}/20</h3><h4>Verdict:</h4>";
if($_SESSION['score'] <= 5) echo "<p id=\"verdict\"><span>S</span>everely <span>H</span>indered <span>I</span>n the <span>T</span>est!</p>\n";
if(($_SESSION['score'] > 5) && ($_SESSION['score'] <= 10)) echo "<p id=\"verdict\"><span>C</span>ould <span>R</span>ead <span>A</span>nd <span>P</span>ractice more.</p>\n";
if(($_SESSION['score'] > 10) && ($_SESSION['score'] <= 15)) echo "<p id=\"verdict\"><span>A</span>cronyms a<span>R</span>e <span>S</span>o <span>E</span>asy!</p>\n";
if($_SESSION['score'] > 15) echo "<p id=\"verdict\"><span>S</span>uper <span>A</span>cronym <span>S</span>pecialist</p>";
echo "<p id=\"compare\"><a href=\"results.php\">See how you compare! <img src=\"images/arrow.png\" /></a></p>";
}
?>

hcdarkmage · March 11, 2010

the simple answer would be to take the number they got right and divide it by the total number of questions.

$rightAnswer = $session['correct']; // Or whatever the code is for this.
$totalQuestions = $numberOfQuestions; // Same here.
$perc = $rightAnswer/$totalQuestions;

echo "You got ".$perc."% of the questions correct.";

doctor-Eggman · March 11, 2010

You are really gonna hit me, but where do I add that in the code?

hcdarkmage · March 11, 2010

You are really gonna hit me, but where do I add that in the code?

That is a good question. My bets would be somewhere AFTER the score is tallied. Other then that, without seeing the whole thing, I wouldn't know where you'd put it. :shrug:

doctor-Eggman · March 12, 2010

Ok I did get some code that shows a percentage. It shows it after the score out of 20 though. So it goes like " you scored 4/20 your percentage is 40" I am definatly moving in the right direction.

What I am looking for now is for the mark out of 20 to not be shown at all and only the percentage is shown. Also the score out of 20 goes to a leaderboard what I want is the percentage to go to the leaderboard instead.

I know I am a pain in the ass but Any help and I would be exstatic.

I will provide the code here.

This is the code in the test part that I belive will send it to the leaderboard and the one that shows the results.

<?php } else {
$file = "leaders.xml";
$xml = simplexml_load_file($file);
$user = $xml->addChild('user');
$uname = $user->addChild('name',$_SESSION['user']);
$uscore = $user->addChild('score',$_SESSION['score']);
$xml->asXML("leaders.xml");

echo "<h2 id=\"score\">{$_SESSION['user']}, your final score is:</h2>\n
<h3>{$_SESSION['score']}/20</h3><h4>Verdict:</h4>";

//changed code
$percent=$_SESSION['score']/20*100; //work out a percentage, divide the score by total an *100
echo "<p>Your Percentage: ".$percent."</p>";


if($_SESSION['score'] <= 5) echo "<p id=\"verdict\"><span>S</span>everely <span>H</span>indered <span>I</span>n the <span>T</span>est!</p>\n";
if(($_SESSION['score'] > 5) && ($_SESSION['score'] <= 10)) echo "<p id=\"verdict\"><span>C</span>ould <span>R</span>ead <span>A</span>nd <span>P</span>ractice more.</p>\n";
if(($_SESSION['score'] > 10) && ($_SESSION['score'] <= 15)) echo "<p id=\"verdict\"><span>A</span>cronyms a<span>R</span>e <span>S</span>o <span>E</span>asy!</p>\n";
if($_SESSION['score'] > 15) echo "<p id=\"verdict\"><span>S</span>uper <span>A</span>cronym <span>S</span>pecialist</p>";
echo "<p id=\"compare\"><a href=\"results.php\">See how you compare! <img src=\"images/arrow.png\" /></a></p>";
}
?>

This is the code in the XML file that is storing the the leader information

<?xml version="1.0" encoding="UTF-8"?>
<users>
  <user>
    <name>Bobby</name>
    <score>10</score>
  </user>
  <user>
    <name>Billy</name>
    <score>1</score>
  </user>
</users>

and this is the show leaders code from the functions.

function showLeaders($file,$limit,$group = null) {
    $leaders = array();
   
    // Load the xml file and place all users and associated
    // scores into the 'leaders' array.
    $xml = simplexml_load_file($file);
    foreach($xml->user as $user) {
        $name = (string)$user->name;
        $score = (string)$user->score;
        $leaders[$name] = $score;
    }
       
    // Sort the leaders array numerically, highest scorers first.   
    arsort($leaders,SORT_NUMERIC);
    
    // Initialise our $counter variable to '1'.
    $counter = 1;

// Start a html ordered list to hold the leaders.
    $output = "<ul class=\"leaders\">\n";
    
    // Loop through the 'leaders' array and wrap each username and score
    // in <li> tags. If the user is the current $_SESSION['user'], wrap
    // the name/score in <strong> tags too.
    foreach ($leaders as $key => $value) {
        // Check that $counter is less than $limit.
        if ($counter <= $limit) {
            if ($key == $_SESSION['user']) {
                $output .= "<li><strong>$key:</strong> $value/20</li>\n";
            } else {
                $output .= "<li>$key: $value/20</li>\n";
            }
            // Check to see if $group parameter has been passed.
            // If it has, create separate lists according to the $group variable.
            if ($group) {
                // Use the modulus operator(%) to create new sub-list.
                if($counter % $group == 0) {
                    $output .= "</ul>\n<ul class=\"leaders\">\n";
                }
            }
        }
    // Increment the $counter. 
    $counter++;
    }
    // End the ordered list.
    $output .= "</ul>\n";
    
    // Print out the ordered list.
    echo $output;
}

You have all been really helpful so far and this could be me if I get this going. Any and all help would be INSANELY grateful it really would. Thank you!

hcdarkmage · March 12, 2010

Ok I did get some code that shows a percentage. It shows it after the score out of 20 though. So it goes like " you scored 4/20 your percentage is 40"

First . . . your math function is a little off. 4 out of 20 is only 20% not 40%. You may try redoing your math function to something like this:

$scorePer = $right / $total;
$percent = $scorePer * 100;

For some reason your math function is working funny. I don't see how it got 40 percent.

As for doing it percent wise, try something like this:

if($_SESSION['percent'] <= 25) echo "<p id=\"verdict\"><span>S</span>everely <span>H</span>indered <span>I</span>n the <span>T</span>est!</p>\n";
if(($_SESSION['percent'] > 5) && ($_SESSION['percent'] <= 50)) echo "<p id=\"verdict\"><span>C</span>ould <span>R</span>ead <span>A</span>nd <span>P</span>ractice more.</p>\n";
if(($_SESSION['percent'] > 50) && ($_SESSION['percent'] <= 75)) echo "<p id=\"verdict\"><span>A</span>cronyms a<span>R</span>e <span>S</span>o <span>E</span>asy!</p>\n";
if($_SESSION['percent'] > 75) echo "<p id=\"verdict\"><span>S</span>uper <span>A</span>cronym <span>S</span>pecialist</p>";
echo "<p id=\"compare\"><a href=\"results.php\">See how you compare! <img src=\"images/arrow.png\" /></a></p>";
}

Basically, change $score to $percent and see if that works.

Hope that helps.

doctor-Eggman · March 12, 2010

oh that wasnt the maths from it, I did that awful maths in my head on the spot as an example haha.

I finally got it displaying a percentage. unfortunately my leaderboard still shows it as something/20. Any clue how I can make the leaderboard show the percentage?

hcdarkmage · March 12, 2010

I think if you change these areas to your percent variable:


$uscore = $user->addChild('score',$_SESSION['score']); // <- Here


echo "<h2 id=\"score\">{$_SESSION['user']}, your final score is:</h2>\n
<h3>{$_SESSION['score']}/20</h3><h4>Verdict:</h4>"; // <- Here

And the same in your xml:

<?xml version="1.0" encoding="UTF-8"?>
<users>
  <user>
    <name>Bobby</name>
    <score>10</score> // <- Here
  </user>
  <user>
    <name>Billy</name>
    <score>1</score> // <- Here
  </user>
</users>

And in the leaders board:

function showLeaders($file,$limit,$group = null) {
    $leaders = array();
   
    // Load the xml file and place all users and associated
    // scores into the 'leaders' array.
    $xml = simplexml_load_file($file);
    foreach($xml->user as $user) {
        $name = (string)$user->name;
        $score = (string)$user->score; // <- Here
        $leaders[$name] = $score; // <- Here
    }
       
    // Sort the leaders array numerically, highest scorers first.   
    arsort($leaders,SORT_NUMERIC);
    
    // Initialise our $counter variable to '1'.
    $counter = 1;

// Start a html ordered list to hold the leaders.
    $output = "<ul class=\"leaders\">\n";
    
    // Loop through the 'leaders' array and wrap each username and score
    // in <li> tags. If the user is the current $_SESSION['user'], wrap
    // the name/score in <strong> tags too.
    foreach ($leaders as $key => $value) {
        // Check that $counter is less than $limit.
        if ($counter <= $limit) {
            if ($key == $_SESSION['user']) {
                $output .= "<li><strong>$key:</strong> $value/20</li>\n"; // <- Here
            } else {
                $output .= "<li>$key: $value/20</li>\n"; // <- Here
            }

Try changing those to your percentage value. i think that will take care of your problem. Oh, and take out the /20 that is there.

doctor-Eggman · March 14, 2010

I changed all you said to the percent variable and it worked...sort of. It is now having a really really odd problem. When I do the test and complete it. I get my score as normal. For example I will so the test and it will say "your percentage was : 95%" thats great....then when it shows the leaderboard the score will show i got say 70% or something. One time i tried it and got 100% and then the leaderboard showed that i got 60%.

So it is showing a percent...just the wrong one. Why on earth would it be doing this? Any idea why its giving me a seemingly random percent instead of the one i got.

hcdarkmage · March 15, 2010

Post your changed code. It may not be resetting the percent values, so it might just be running a total percentage based on how many times you do the quiz.

doctor-Eggman · March 15, 2010

function showLeaders($file,$limit,$group = null) {
    $leaders = array();
   

    $xml = simplexml_load_file($file);
    foreach($xml->user as $user) {
        $name = (string)$user->name;
        $score = (string)$user->score;
        $leaders[$name] = $score;
    }
       

    arsort($leaders,SORT_NUMERIC);
    
    
    $counter = 1;
    
    
    $output = "<ul class=\"leaders\">\n";
    

    foreach ($leaders as $key => $value) {
       
        if ($counter <= $limit) {
            if ($key == $_SESSION['user']) {
                $output .= "<li><strong>$key:</strong> $value/20</li>\n";
            } else {
                $output .= "<li>$key: $value/20</li>\n";
            }
       
            if ($group) {
                // Use the modulus operator(%) to create new sub-list.
                if($counter % $group == 0) {
                    $output .= "</ul>\n<ul class=\"leaders\">\n";
                }
            }
        }
    
    $counter++;
    }
    
    $output .= "</ul>\n";
    
    
    echo $output;
}

That is the code I changed.

doctor-Eggman · March 15, 2010

Oooops that wasnt the code I changed at all. Thats the way it was sorry

function showLeaders($file,$limit,$group = null) { 
$leaders = array();


	$xml = simplexml_load_file($file);
	foreach($xml->user as $user) {
		$name = (string)$user->name;
		$percent = (string)$user->score;
		$leaders[$name] = $percent;
	}


	arsort($leaders,SORT_NUMERIC);


	$counter = 1;


	$output = "<ul class=\"leaders\">\n";


	foreach ($leaders as $key => $percent) {
		// Check that $counter is less than $limit.
		if ($counter <= $limit) {
			if ($key == $_SESSION['user']) {
				$output .= "<li><strong>$key:</strong> $percent%</li>\n";
			} else {
				$output .= "<li>$key: $percent%</li>\n";
			}

			if ($group) {
				// Use the modulus operator(%) to create new sub-list.
				if($counter % $group == 0) {
					$output .= "</ul>\n<ul class=\"leaders\">\n";
				}
			}
		}

	$counter++;
	}

	$output .= "</ul>\n";


echo $output;
}

Sorry about that. But yeah its still doing it.

doctor-Eggman · March 16, 2010

Any idea mage?

hcdarkmage · March 16, 2010

Any idea mage?

I think you finally lost me. Just looking at the code you provided doesn't tell me anything about what you changed. Maybe if you put comments in on what you changed I could see the problem easier. Maybe that or my weekend has taken a bigger toll on me then I thought.

Put comments in where you made the changes and try and show the original underneath and we will see where the problem is.

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