limit the data from database inside php code

Question

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

Possible duplicate of: stackoverflow.com/a/4329447/5503275

DsRaj
– DsRaj

2018-06-08 05:09:26 +00:00
Commented Jun 8, 2018 at 5:09 — DsRaj
– DsRaj, Commented Jun 8, 2018 at 5:09
@DsRaj this not simply mysql. its mysql inside php

user9750871
– user9750871

2018-06-08 05:12:34 +00:00
Commented Jun 8, 2018 at 5:12 — user9750871
– user9750871, Commented Jun 8, 2018 at 5:12

Devsi Odedra · Accepted Answer · 2018-06-08 05:08:13Z

1

Just use ORDER BY and LIMIT

 $response=mysqli_query($con,"select * from prometric ORDER BY RAND() LIMIT 20");

answered Jun 8, 2018 at 5:08

Devsi Odedra

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2 Comments

user9750871 Over a year ago

no errors. the limit query is working.but the questions displayed in same order

user9750871 Over a year ago

do you know to use shuffle function inside my page

code-mocker · Accepted Answer · 2018-06-08 05:14:33Z

0

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.

answered Jun 8, 2018 at 5:14

code-mocker

513 bronze badges

3 Comments

user9750871 Over a year ago

where to add this shuffle function?

code-mocker Over a year ago

$result=shuffle(mysqli_fetch_array($response,MYSQLI_ASSOC)) Probably clean this code up

user9750871 Over a year ago

can you tell me how to edit this query to get the id from the url $response=mysqli_query($con,"select * from prometric ORDER BY RAND() LIMIT echo $_GET['id']; "); to limit the questions

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