i have created a quiz website. i have created a file like below and t the below file is used to fetch the data comming from it is called using ajax in the main html page.data from database
<?php
// Start the session
session_start();
$con=mysqli_connect("localhost","root","","quiz"); // change here to your data
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// Check the number of all questions, if next_id is more than last question, back to first or whatever you want;
$response=mysqli_query($con,"select * from prometric");
$number_of_all_questions = mysqli_num_rows($response);
if($_POST['next_id'] == 0){
// reset to default
$_SESSION["correct_score"] = 0;
$_SESSION["not_correct_score"] = 0;
}
if($number_of_all_questions <= $_POST['next_id']){
// Quiz finished, show results
echo"<div>
<h2>Results:</h2>
<p>Correct answers: {$_SESSION['correct_score']}</p>
<p>Wrong answers: {$_SESSION['not_correct_score']}</p>
</div>";
}else{
// query next question
$response=mysqli_query($con,"select * from prometric WHERE id =(select min(id) from prometric where id > {$_POST['next_id']})");
?>
<?php while($result=mysqli_fetch_array($response,MYSQLI_ASSOC)){ ?>
<div id="question_<?= $result['id'] ?>" class='question' data-next-question="<?= $_POST['next_id'] ?>"> <!--check the class for plurals if error occurs-->
<h2><?= $result['id'].".".$result['question_name'] ?></h2>
<div class='align'>
<input type="radio" value="1" id='radio1' name='1'>
<label id='ans1' for='radio1'><?= $result['answer1'] ?></label>
<br/>
<input type="radio" value="2" id='radio2' name='2'>
<label id='ans2' for='radio2'><?= $result['answer2'] ?></label>
<br/>
<input type="radio" value="3" id='radio3' name='3'>
<label id='ans3' for='radio3'><?= $result['answer3'] ?></label>
<br/>
<input type="radio" value="4" id='radio4' name='4'>
<label id='ans4' for='radio4'><?= $result['answer4'] ?></label>
</div>
<br/>
<?php /*<input type="button" data-next-question="<?= $_POST['next_id'] ?>" id='next' value='Next!' name='question' class='butt'/> */?>
</div>
<?php }?>
<?php }?>
<?php mysqli_close($con); ?>the data comes in the same order every time i fetch it, i want the data to be random and limit the data to certain number. how can i do this
</div>
Just use ORDER BY and LIMIT
$response=mysqli_query($con,"select * from prometric ORDER BY RAND() LIMIT 20");
You can use the shuffle($your_array) function to randomise your array.
For the limit use $response = "select * from prometric LIMIT 100"; if this is what you're looking for.