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⚡ Optimize answer randomization in quiz.php #16

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⚡ Optimize answer randomization in quiz.php #16

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14 changes: 9 additions & 5 deletions quiz_system_git/quiz.php
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Original file line number Diff line number Diff line change
Expand Up @@ -31,9 +31,10 @@
//checking if user has already taken this quiz
$stmtCheck = $pdo->prepare("SELECT id FROM quiz_takers WHERE username = :username AND quiz_id=:quizID");
$stmtCheck->execute(['username' => $roll_no, 'quizID' => $final_quiz_ID]);
$taken = $stmtCheck->fetch();

//if user already did, redirect to index.php with error
if($stmtCheck->rowCount() > 0){
if($taken){
$user_msg = 'Sorry, but '.$roll_no.', has already attempted the quiz, '.$quzz_name.'!';
header('location: index.php?user_msg='.urlencode($user_msg));
exit();
Expand Down Expand Up @@ -72,8 +73,9 @@
$stmtQ->bindValue(':quizID', $final_quiz_ID);
$stmtQ->bindValue(':limit', $total_questions, PDO::PARAM_INT);
$stmtQ->execute();
$questions = $stmtQ->fetchAll();

if ($stmtQ->rowCount() < 1) {
if (count($questions) < 1) {
$user_msg = 'Hey, weird, but it seems there are no questions in this quiz!';
header('location: index.php?user_msg='.urlencode($user_msg));
exit();
Expand All @@ -83,7 +85,7 @@
$m_display_ID = 1;

//looping through the questions and adding them on the page
while($m_row = $stmtQ->fetch()){
foreach($questions as $m_row){
//initializing the options
$m_answers='';

Expand Down Expand Up @@ -116,15 +118,17 @@
}

//gathering options of the question here
$stmtAns = $pdo->prepare("SELECT * FROM answers WHERE question_id=:questionID ORDER BY rand()");
$stmtAns = $pdo->prepare("SELECT * FROM answers WHERE question_id=:questionID");
$stmtAns->execute(['questionID' => $m_question_id]);
$answers = $stmtAns->fetchAll();
shuffle($answers);

$m_answers .= '<tr>
<td></td>
<td>
';
//adding html to individual options here
while($m_row2 = $stmtAns->fetch()){
foreach($answers as $m_row2){
//getting row attributes in variables
$m_answer = $m_row2['answer'];
$m_answer_ID = $m_row2['id'];
Expand Down