Avoid duplicate value in PHP MySQL pagination with rand()

[simon2x1]

I have a pagination that load more when I click on the load more button, which I got from the below URL http://makitweb.com/load-more-results-with-jqueryajax-and-php/

Whenever I add RAND() it always duplicates the value.


index.php

<?php

$rowperpage = 10;

$allcount_query = "SELECT count(*) as allcount FROM users order by id";
$allcount_result = mysql_query($allcount_query);
$allcount_fetch = mysql_fetch_array($allcount_result);
 $allcount = $allcount_fetch['allcount'];

$query = "select * from users order by RAND() asc limit 0,$rowperpage ";
$result = mysql_query($query);
while($row = mysql_fetch_array($result)){
?>

<div><h1><?php echo $row['id']; ?></div>

<?php
}
?>

<h1 class="load-more">Load More</h1>
<input type="hidden" id="row" value="0">
<input type="hidden" id="all" value="<?php echo $allcount; ?>">

getData.php

<?php
$row = $_POST['row'];
$rowperpage = 10;


$query = 'SELECT * FROM users ORDER BY id limit '.$row.','.$rowperpage;
$result = mysql_query($query);

$html = '';
while($row = mysql_fetch_array($result)){

$html .= '<div><h1>'.$id.'</h1></div>';

}
?>

[Luuk]

"Whenever I add RAND() it always duplicates the value."
Which value is duplicated?

Also about line #5, there is no need to do an 'order by' here, because the COUNT will not be different if it's ordered or not ....